Once again I'm stumped about what the car is giving me crap for this time, I hate never ending lists

copied from my thread on the HPT forums, files are in that thread since this site doesn't like the hpt format

WOT RPM oscillations - HP Tuners Bulletin Board

Quote Originally Posted by SandmanGTP View Post
I'm trying to WOT tune my GTP but the car starts acting weird in the upper RPMs. During normal driving the car runs and shifts fine, no weird noises or codes. At about 4500 RPM the car stumbles a little then once it gets to about 5500 is when the oscillation starts and it may or may not shift, when it does its not exactly smooth. I'm not sure what it is since it started doing this all of a sudden. The plugs were just changed since my last set had a fouled plug, I already gapped them down to ~.042 already, plug wires are new as well. The timing tables are stock for a 05 GTP and the tranny tables are stock as well.
Quote Originally Posted by Chris@HPTuners View Post
looks like belt slip or a MAF problem or some weird air leak, the MAF oscillations is what causing the problem.

Also, your MAF table looks very weird at the higher Hz

Quote Originally Posted by SandmanGTP View Post
Edit:

New belt, that's not it. I did do a quick pull without the belt, the car didn't have the oscillations but it did take a couple of seconds before it decided to shift, no slipping into shifts.

And guess what decides to come on...the SES so I'll find out at lunch what its for

Quote Originally Posted by SandmanGTP View Post
Codes read out
P0133 slow response bank 1 sensor 1, I did have a leaking DP for a while
P0243 turbocharger wastegate solenoid 1, I don't have the solenoid anymore

Cleaned the MAF and ran without the BBV hooked up, same problem

I did do a pull at 75% throttle I suppose and car gave me no issues