2001 V6 throttle stutter [SOLVED sort of]

EDIT: SOLVED. SEE POST #47.

Not exactly sure what this could be. This happens upon start up and under power when trying to drive the throttle cuts out creating a jerking motion almost like the clutch slipped. This video is taken right after start up and just letting it idle and warm up not touching anything (towards the end the engine almost kills itself). I've noticed it has gotten worse as the tempature outside gets colder. I've cleaned the MAF and the Throttle body changed the air filter. Any input would be greatly appreciated.

https://youtu.be/8HIJWKCsRMQ

 

cleaned the IAC under the TB?

 

Agree with Frizz. Has the Throttle Body ever been cleaned? To effectively clean it, you should remove it. Not that difficult and allows you to clean not only the front of the throttle plate, but the back side as well.
Also, remove the negative cable from the battery for a couple of minutes. This will reset the computer (fuel / air mapping).
Good Luck!

 

Or just pull the EFI fuse so you don't lose all your radio stations

 

Could also be ignition/spark related or a flaky cam/crank sensor.

 

The AIC is only useful at idle conditions, not under power like OP says. If it idles fine, that's not the issue. Extremely unlikely a dirty throttle body is the issue either- besides the fact that OP says he's cleaned it. How long after startup does this occur? If it's immediately after startup while the engine is cold, then look to the MAF, injectors, plugs, wires, and crank sensor (this being the most unlikely). Being that the issue occurs while the engine is cold eliminates a few sensors, which is helpful.

 

I was going on his video and the fact he already cleaned the MAF.

 

MAF can internally fail despite how clean it is. It needs to be tested for voltage drop-outs.

 

The video was taken right after start up the engine was still cold from sitting last night but it also happens when the engine is warm and running. On my way back from work just now it died at two different stop lights after I push the clutch in. I have also noticed that my gas mileage has gone to complete shit.I cleaned the throttle body when I cleaned the MAF a couple of weeks ago, but Ill take it apart again this weekend and clean it again along with the IAC sense it'll all be apart.
Thanks for the input everyone.

 

Sounds like maf problems to me.

 

So over the weekend I cleaned out the throttle body again along with the IAC. The stutter seemed to go away for a little bit but it has come back, not as noticeable anymore, and its only at lower RPMs. No longer does it stutter hard at start up but it still stutters at lower RPMs and idle occasionally. It hasn't died while stopped in neutral as of yet.

 

Bringing this back up because the problem still hasn't gone away completely. It has been getting really bad as the weather is getting colder. It still shows the same symptoms as the original post, but the shuttering feels like its getting worse. Still no check engine light though.. Anyone have any suggestions?

 

I'm reposting on here because my problems went away for a few months but now they're back. Same symptoms as before. A few months ago I cleaned the MAF, changed spark plugs and wires, cleaned the throttle body and IAC, changed the fuel filter. And cleaned up the grounds on the engine block. It ran fine for a few months now the problem came back. I bought a new MAF and hooked it up. Now the truck won't turn on. It will crank and turn over but I can't get it started. Any help would be great

 

I bring this bad from the dead in case anyone was interested in the fix to my problem..
It took me a little over a year and a half to out the stutter I have been experiencing. To begin I replaced the spark plugs, and wires (which helped), replaced the fuel filter, cleaned all the grounds and added another ground to the block, replaced the IAC, cleaned the TPS, and the throttle body. Cleaned the MAF and then replaced it. None of this worked. The stutter kept coming back, eventually the truck was having a really hard time starting. Every time I tried to start it, I would have to floor it and it would eventually turn over. I figured it was something with the fuel delivery. AND STILL NO CEL.
ANYWAY... After endless hours of researching here and other forums, I finally found the problem...

The ECT (Engine Coolant Temperature) sensor was bad. This sensor, was causing a sporadic idle, as well as the stutter and the engine dying while driving, it was worse under load. Apparently this sensor is linked to the fuel delivery and will cut fuel or add fuel to the mix depending on what temperature the sensor was reading. This is why I would experience the terrible stutter, lack of fuel.

Mainly updating this for anyone else who experiences this problem in the future.

 

Thanks for sharing man - I just replaced mine on the engine I'm swapping in since it was easy to get to when I had it down to point where I needed to have it to swap.

You should edit the title with [Solved] or something and the symptoms and fix though. It'll be better for searches in the future. Glad you got it solved!

 

I'm kinda bummed TW hasn't helped you much. Or seem too care

 

I kind of felt the same way... Beyond cleaning the throttle body and the MAF, no one had any suggestions except suggesting the same things over and over again. The real frustration for me was that obviously nothing was working and the times I took it to two different shops they found nothing wrong. The engine wouldn’t even stutter while there. So money down the drain.

Oh well it’s fixed now

 

I would not have guessed the temp sensor either but it makes prefect sense as I believe the Ecu adjusts the fuel trims according to ambient temp. Glad you stuck with it and shared the result.

 

I am curious as to how you determined that the ECT was the culprit. Was scan tool used for live data and if so what did it show?