backfires when warming up
 

anyone know why my 91 n/a is doing this? sometimes it starts as soon as i start it...sometimes it as long as 2 min. after i start it cold...once it warms to the idle temp all is well.

back pressure?

there is none at all. no cats ... its a borla cat back and up front there is a s.s. 2 1/2 inch down pipe into a s.s. works glass pack... its wide open.

could a bad or leaking ACV cause this?

ive heard of sevens back fireing with aftermarket exhausts, onlt while they're in the higher RPM's though, maybe its that? how much did that borla set you back?

then ... about $420.00 shipped ... now about 480.00 shipped n-i-f-n iove it. hod to mod it some for what i wanted from it ...cut all flanges off and replaced with slip joints for a true leak free stink pipe. anyway i still need help with my 7.

heeeeeeelp! pleeeeeeease!