351W THUNDER

if i keep my 351w in first and bring it to about 3,000 rpm and let off and between 2500-2000rpm it pops a little bit.. is that the timing or not enough fuel or even to much fuel? im going to put my timing light on it and all but just asking u guys..

Explosive

Do you have an aftermarket exhaust ?

351W THUNDER

yea 2 1/2 tru dual, headers and magnaflow exhaust
It never did it be4. we turned my idle down and it does it