vehicle is 06 buick rainier, sbe 5.3, tick performance towmax stg2 cam, tbss intake manifold, full dual exhaust, pump 93
i built the exhaust myself and i know i have some areas that are especially tight and may contact the frame, so some false knock is expected, however, logging today, i see that i got 6* at mild throttle randomly, yet get 0* at 80% throttle. including current tune and latest log file.
should i be looking at spark tables or something else? seems to happen at random at low throttle. it happens early in the scan.
also, havent touched my ve tables because when i fail the maf to go sd, the trans shifts terribly and im not trying to blow up my transmission. t42, 4l60
thanks in advance guys.