I checked thee exhaust flow and it was fine. So I had the emissions tested and the guy said it passed cleanly. I didn't get the numbers, but he said my cat is working as it should be.

Ok, I have an 02 bonneville. Problems; poor acceleration, 15-20 mpg drop, incline or no at 45-50 mph it sputters, with incline won't go over 55 mph, there is a weird sound like air being sucked or forced out from under the engine compartment while it's sputtering, it feels like the car is being ...