I have a 1999 chevy tahoe and it has no power and a exhaust leak at the pipe

[erhardttj]

that connects to the manifold? engine runs smooth just noise from under neith the motor coming out exhaust connecting to manifold is there a gasket I tighten it a little did nothing.

[12pleze]

If you take off muffler or has leaks at manifold, air fuel mix will be off and car will not run right as computer will malfunction.

[Mark]

Hate to be the bearer of bad news but. maybe a clogged cat. Part from our store is $385. from the exhaust manifolds down to the muffler flange. Part only. About $65.-200. to get it installed depending on where you live.