Alright, I was coming down the interstate sunday, comin back to school, it was about 80mph for 1 1/2 hrs and as i let off to go 55, i hear it crack

so i start testin my car. I hit the gas about 3/4+ to the floor and when i let off as the rpms drop it sounds like air bubbles are coming out of the exhaust or somethin.. hard to describe, ill go record it if i have to

any idea what this is? is it normal, and is it slowin me down?

Thanks!
Scott

 

My car does it too. '88 TA with 305TPI, automatic trans, 2.73 gears, SLP 3" 2OTL cat-back and stock manifolds/cat. I'm pretty sure its normal, though I was wondering about it again today when I was messing around. Hold it in first, rev it up a bit (don't need to floor it) and let off the gas and it does the same thing. I'm pretty sure its normal...

 

Then again, it could be lean missing from the computer's DFCO command (decel fuel cut off) if it is commanding too lean of a mixture..

 

that's just back pressure, it's no big deal. even your high-end cat-backs will pop like that. Best way to remedy the problem: Long tubes, high-flow cats, 3" y-pipe.