90mustanggt

Hey guys I have a 1990 mustang Gt. I took of the air tube behind the heads and found that is was clogged with alot of carbon and that was why I think i had a sound like I had an exhaust leak. I wasn't quite sure what to do. Wheather i should repalce the tube, clean the old one, or plug the holes that i have and just eliminate the tube in the back of the engine. Any ideas??

Andrew