I am experiencing some body shake when i keep my foot on the gas without really accelerating and when i start going unless i floor it. I got flowmasters a couple weeks ago and my service engine soon light came on a couple of days before that. I assume one of those things is the cause but does anyone know which one is more likely? thanks

 

Im not 100% sure but I had the same body shake as you with the service engine light on and it ended being a bad spark plug. The guy said I was missing cylinder 3. Hope this helps

 

ok thanks. did you take it to the dealer. how much did the fix cost you? thanks

 

yeah I took it to where I bought it, They charged me $125 and when I went to start the car it was still messed up. So they screwed up and found out what the real problem was. So they did it basically free of charge since the $125 was for an oil change and something else.