Please Help Running Rough!

I have an 04 Taco 3.4 and I left for work the other morning. Truck cold and about a 100 yards down road truck started running very rough. Check Engine light flashing. I could go light on the throttle and it was not as bad but if I got above a certain rpm or it changed gears it would start shaking. I got out of the truck and manifold and cat were glowing red. I got to work code was P0306 and a couple more missfire codes. The missfires were on #3 and #6. I changed the plugs, did sea foam, and cleaned MAF sensor. No change. I checked for archs showing at night on the coils and wires and no archs. Please if anyone has any ideas?

 

Check the EGR valve moves freely and for any electrical wiring that may be caught around the egr valve. Check vacuum hoses aren't cracked (in fact just change the vacuum hoses out when you get the chance) Good luck.

 

Where is the egr valve and do you know of any post how to change the vacuum lines. Im not the best mechanic

 

The egr should look something like this. You should be able to push the diaphram (under where the rubber hoses enter and exit) If its solid as a rock you need a new valve (again, if this is even the problem)

If your vacuum hoses are dried out, cracked or disconnected you'll get a vacuum leak.

You said you cleaned the throttle body but did you clean the Idle Air Control?

You say a misfire on 3 and six; I'm sorry but someone else will have to chime in on that one.

 

If #3 and #6 cylinder are sparked be one coil maybe that coil is bad. Sorry I'm not familiar with the 3.4.

 

Your CAT/CATS are maybe plugged up & toast as far as the red hot manifold & cats go, if its plugged from all the shit in the cat burning up & not allowing exhaust to flow as it should. Ya gotta somehow narrow down all the codes being thrown I guess...

 

You have a super rich condition which is overworking the catalytic converter. That's why it was glowing. Obviously, this isn't good for the converter. It can handles small incursions into these heat ranges, but often leads to melted converter elements. Also leads to clogged converters.

"rough engine" comments could be referring to fouled plugs which would confirm a mixture issue

 

Bump I was driving home today and while I was at a stop light all of a sudden my truck started running rough and lost a lot of power. So I pulled up to my friends to check and see what happened so I closed the hood and the truck started right up and was running fine so I drove home. I just went to go to a friends house and now the truck is running rough again with the check engine light on. I just bought this truck last week so I am sure it needs plugs but hopefully its not a coil pack. No where around here does free check engine light reads so I will have to try to find someone that has a code reader. What else would you guys think might be the problem?