It seems that after the complete PI motor swap in my 96 GT the engine pings,especially say for instance if do a rolling stop through a stop sign and only downshift into second. Basically anytime the engine lugs. It's almost like there is too much advance or not enough fuel. It only seems to happen when the engine is fully warmed up. I still haven't got a tuner since the complete PI motor swap. Could the tune or lack of be causing the excess pinging ?