EderFox,
When we reference cold, we mean literally and before 2 minutes passes for the testing. Def below 60 degrees on the PCM CTS or coolant temp sensor.. This problem occurs when the PCM goes into closed loop mode. In my case, it is 99% gone when absolutely cold and before 2 minutes or so passes. I can be very aggressive on it in 4rth gear from 39 mph and it doesnt stutter. 3rd gear is all the way cool too - I can stomp that sucker too going 29mph in 3rd and no stutter when cold. I try that same thing after it starts to get warm or at operating temp and boom, nasty stuttering the whole way up. These are just extreme examples to show that even under very hard acceleration the condition is almost non-existant when cold. The spark plug gaps and wires and coil are static, they would cause a problem regarless, cold or warm - open or closed loop. The plugs should all be gapped correctly and inspected, along with the wires, to make sure they arnt contributing to the problem. Myself, I replaced the grounds from my tranny/fuel rail/coil with 4 gauge wire directly to frame points just yesterday. My opinion is that the PCM is maitaining a very lean a/f ratio when under IRMC open point and that it def. does not give adequate/quick fuel enrichment when accelerating in any form - until you hit IRMC open point. Warmonger confirmed it was running lean when the stuttering happens and that is what it is, lean-misfires - from what we have seen so far. K&N oil on the stock paper filter would only clog up the spaces inbetween the paper fibers I would think and also be absorbed into the fibers, expanding them closing off more space to breath - just personal conjecture here nothing concrete on that. TtYs.
