2006 GTO- spuddering after Diablo Tune

[ralph06gto]

I just bought a brand new diablo predator handheld (U7191) for my 2006 Pontiac GTO w/ the LS2. I go to tune my car with the "diablo" performance tune and all is great seems to run fine through shifts and flooring it, up until I shift into 4th gear (or higher) and over 40 mph between 1800-2500 rpm (NOT WOT or anything just cruising) It begins to spudder, almost like uncontrollable jumping


Yesterday I went ahead and data logged with the tuner, and according to the DSLOGREDUX application I needed to increase my injector slope by 4%.. I Went ahead and did that but no change.. This diablo tune makes the car run real good and strong but as soon as you hit a consistent RPM it starts to spudder... usually in a higher gear after 40 mph and 1800-2200 rpm.. Like I said, I return the GTO to factory tune and the spuddering is gone... This was a brand new tuner and all I did was import the diablo tune(without adjusting parameters) and got this spudder...Real annoying....I'm getting bummed out after spending around 300 dollars and can't use the tune, anyone could help?? Thanks

[mikel]

I've honestly never seen such an issue...did you try restoring the stock tune to see if the issue persists?

[06MonteSS]

his "stock tune" isn't really a stock tune... heh.. it was tuned before by something/someone else...

I'm workin with him on a proper tune for his car...