First, I purchased an '01 4x4 about 3 years ago and love it! My first truck and I have no idea how I made it so long without one. However...
It has a standard transmission with the 3rz engine and over 195k. For the last few months this problem was been getting progessively worse. When under power at low rpm's and the engine luggs out, it hesitates/stutters severley. Once the rpm's are high enough the problem goes away. I thought it might be the fuel filter, so I changed that pain in the ass part, no fixee.
There was NO CODE for months, so we tried to clean the throttle plate. On my way home I tried to "push it through" the rough running,which finally made the check engine light came on. For the next few days if I lugged it for long enough (about 1 min) the check engine light would flash for about five seconds, then go out. The codes it gave were:
Random cylinder misfire
Cylinder #2 misfire
We changed the plugs and switched the coil on #1 and 2 to see if the code would change to cylinder #1 misfire, no luck. New code though:
EFR insufficient flow
Checked for codes again yesterday. Two "incomplete" codes that I can't quite remember:
O2 sensor something
Cat converter something
After searching this forum, I realized perhaps the drop-in K+N filter I added might be an issue. So today I purchased some MAF cleaner, I'll let you know how that goes. Note- I have checked all the hoses and wires and a can't see anything obviously wrong with them.
Has anyone experienced this or a similar issue? Does the diagnostic plug in the engine compartment take more precise/accurate readings? Is it worth having the dealer check that plug (don't wanna unless I have to)?
Thanks in advance all you Taco lovers!