i have a 87 5.0 lx when its ideling it smells like it flooding it rolls black smoke and when i goose it it backfires thru the intake i thought it was the cam but i installed a new one and it stilldoes it can any one help
sorry if put this in the wrong place new to this site

 

that could be any number of issues. I'll bet you have a fugged up injector. Get thee to a mechanic with a grand in hand.

 

Hi everyone. New to the forum, but not Mustangs. I believe you need a new computer. A buddy of mine had the same problem on an 89 Mustang and after trying several different things (new IAC, TP sensor etc, etc) he finally tried a new computer. Fixed the problem.