Im really confused on what the problem is now. I recently installed Lt's ORy cutout/catback and Cai on my 93 lt1 t/a . It was fine for the first 4-5 days now it runs awful. When i try to put the peddle down the car shakes a ton and the sound is odd mellow not normal. Same with the cutout is shakes a ton and sounds like a loud rattle. I did drive in the rain but not for long before this started but i cant think it would be that.I also havent gotten a tune yet but i am tommarow. Im also having the shop fix the little rattle from when i step on it but this problem i have no idea any ideas help please!!!