Generaly popping is caused by leaks.... nice fresh oxygen gets into the exhaust and actulay ignites little flamming chunks of unburned fuel... and whatever else is in there... poping could sounds kinda wierd... though I had a 72 cutlass and it would let off a nice grumble when I let off the gas... kinda liked it...
-as
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'89 GT Convertible:
TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit
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