yesterday i put in headers and a new exhust from man-a-fre. i got the exhust finally sitauted and i started her up. when i did, she sounded rought and i noticed exhust coming from the engine compartment, i cant see where though, but exhust is also coming out of the tail pipe which is a good sign. there is alot a exhust coming from around the engine and she wont idle, and has slow responce time. where did i mess up?