The last thing I have not done, and I mean last thing but does not show up on any of my trouble codes is the catylic converter. It does sound pretty rough under there and is a bit of exhaust coming out of the connecting piece to the actual muffler part and out the muffler itself. Is there a way to test this? Should I disconnect it and start it up for a minute and see if the motor stops shaking and responds better to the throttle?