I took my Jeep to the dealer the other day because I had a misfire code as well as the p0455. I recently lost the gas cap and found another from a different jeep so I told the dealer not to worry about the P0455 code. Got the Jeep back and the engine is still running rough while there is a load on the engine. It still seems like a misfire but that code is gone now. I was also thinking tires or somthing in the axel, but when i let off the accelorator there is not more vibration. This system be the cause of my problems or should I be looking elsewhere?
Thanks for any help.