my 96 Z28 has an lt1 out of a diff car runs ok but when u get on it it pops and carrys on i had a friend that had a diff turbo put on his car and it did the same thing and he had to have his comp. tuned so im gonna try that unless someone thinks it could b somethin else

 

Put a "turbo" in..... as in forced induction? Definitely need a "tune" for that. What mod's on your replacement engine? What year is the engine out of? F-Body, B-Body of Y-Body engine? A4 or M6?