This is my first post here so go easy on me!
My 2007 GT is pinging on shifts (manual tranny) at part throttle. In other words, I shift to 2nd or 3rd, touch the gas and there's a slight ping for a fraction of a second, sounds like marbles in a coffee can. It doesn't do this all the time, but it gets worse if I have the AC on. This is only at part throttle, I've never heard it at WOT. If I reload my tune it goes away for 50 miles or so then comes back. I have a C&L Street CAI and C&L tunes on a Diablosport Predator tuner. Here's what I've tried, non of which have worked... 91 octane tune with 93 octane fuel, different brands of fuel, dropped global advance timing in the tuner, dropped 2 to 4k timing, richened 2 to 4k WOT fuel, new fuel filter, cleaned the throttle body, cleaned the K&N air filter, 2 tanks of fuel with SeaFoam and a tank of octane booster.
I bought the car used with the tuner and CAI already on it so C&L will not provide me any sport without paying.
New plugs are going in this weekend... anybody got any other ideas?