Thread: 98 GTP popping/missfire/backfire wile under any boost! HELP!

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  1. #1 98 GTP popping/missfire/backfire wile under any boost! HELP! 
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    Ka so heres the story...
    I bought a 98 gtp from an auto wrecker needing an engine, had blown rods...
    only replaced the block using a N/A Block with the supercharged top.
    Ran like a CHAMP for a few months now im having issues i cannot figure out!!

    it gradualy started doing this and got worse as time went

    runs and drives smooth and beautiful under normal driving conditions, but the second i get any boost into it i start bucking/popping/missfiring/backfiring... about as bad as it can get....

    ive replaced spark plugs, plug wires, all 3 coil packs, the ignion chip under coil packs even..
    never changed a thing.. THEN it killed the crank sensor.. upon replacing that the car ran eff'n amazing then bucked out and died, *belts cought the wiring for crank/cam sensors,* replaced that and now back to the issue again.. :s

    recently removed supercharger belt, and the car runs great/smooth fullthrottle and all.... no issue untell that supercharger belt is put back on... could this be????

    there is no codes, i do not have a cat converter, and the o2 sensors have been deleted from the ecm...

    im stumped and sick of waisting money on this thing, tempted to send it right back to that wrecker if this issue doesnt get fixed soon

    i was thinking either one of the knock sensors? waste gate? or possibly a weak fuel pump?

    ??????
    98 GTP popping/missfire/backfire wile under any boost! HELP! Attached Images
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