I just had a 2006 GTO dropped off with a BTR stage 4 cam...at first start this car barely pulled into the shop. After first log I noticed that total ignition timing was in the -2 to maybe 2 degree range with a very random case when it would actually fluctuate between 5/15. At this point I can't even drive car to start logging A/F ratio. Is there something I'm missing in the E40 computers with bigger cams? Or should I start looking into bad map,maf,crank,etc sensors? I attached log and file with all kinds of attempts to rid the 0 degree timing issue. Please help
WEIRD LS2 GTO LOW TIMING STUCK AT 0 DEGRESS.efiHopkins 2006 GTO engine tune_cammed_test.ctz