retard your timing 2 degrees and run lucas fuel injector cleaner through it...get the big quart bottle and dump the whole SOB in there....after about 20min of driving if the pop continues reset your timing call Josh at JSperformance....I'm sure he'll be in here soon to give his $.50
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10
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