mine pops a little when its cold, but within about 30sec. of driving it stops. i would check the simple things that need replacing anyways like- spark plugs, plug wires, and the notorious tfi module, o2's, i would start with plugs and wires though. the reason that i started modifying mine was that i must have floated a valve and it smacked the top of the piston and created a dead cylinder- that made some massive popping noises though. i dunno, good luck
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