Someone please help. I recently changed the heads (stage 2 64cc), cam 222/224, crank pulley, altenator pulley, LT headers, LS6 intake manifold, Screenless MAF, timing chain, oil pump, smooth belows, lid, large diameter y-pipe, loudmouth exhaust, 36lb. injectors, and 3.73 gears, on my 2000 WS6 Trans Am automatic. I paid to have it tuned by LG motorsports and it dosent seem to run right. Recently i started having backfiring problems, bad. It backfires at 60% throttle or more and generrally only at 60+mph. Added to this problem I started hearing pinging to (I do use high octane gas). I purchased EFILive in an attempt to fix the issue. and have made a few adjustments (mostly to transmission settings). Please someone help, I'm not sure what the problem is and how to fix it.:
Also it only backfires when I'm actually in gear, if i run it up to 5000-6000 rpm in neutral it's just fine. (not sure it matters but i thought ,i'd throw it out there)
If someone can take a look at my tune and log and perhaps give me a little advice on what to do. Yes, I'm a newbie, but i'm dedicated to getting this right.