Some Backfiring/knocking - suggestions

[grandprix34]

When i hold the acceleration to 3k in idle (ffp chip/removed limiter) i start hearing and feeling backfiring through the exhaust...then when i let the gas pedal go, I'll here backfiring (or knocking) in the engine compartment...

-spark plugs are new
-wires are new
-ICM was replaced awhile back
-ECM was also replaced wit a 94 Lummy one

Is this a case of a coil or crank sensor going bad or is it a serious "need to rebuild" engine case? Ill take vid/sound if anyone will host it...

by the way, i just ordered an ALDL cable and downloaded the Freescan software to use with my notebook computer.....what parameters should i look for that are out of wack?
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[brian89gp]

Probably cause you're doing it in neutral. This motor runs horrible unless it is under load.