Resurrecting this thread
I have exactly the symptoms described in this thread. Also, there are several other threads describing the same thing but all of them including this one abruptly end without finding the problem.
This surging thing is mainly an annoyance and for me, it only happens after going into boost and then slowing to a 50-55mph cruise at very light throttle. It won't happen under light driving conditions. IMO, I don't think it is the TCC locking and unlocking the converter as the stuttering is so slight and isn't even enough to change RPMs as occurs when the converter locks/unlocks. Has anyone had the same thing and found the source of the problem? I'm leaning more toward my stock style MAF slowly taking a dump on me or possible chip calibration. However, on my Scanmaster, it shows ~5 at idle and it will max out at 255 under WOT with no codes either. Will these MAFs slowly deteriorate and "appear" to be working (i.e.--proper Scanmaster #'s, etc.)
I'm sure it's not my fuel pump, EGR, 02 sensor, injectors, and my BLM's are around 138 at idle. All of the obvious things check out. Still not sure about the TCC solenoid though but as I stated before, this only happens to me after going into boost. Looking for some more input.