Hi every body I just bought a C280 and it has started to miss at idle and when i take off. I have changed the spark plugs and looked at the coils and the look ok. any idea's what to look for.

Also the wipers dont work, the motor works but the wiper just stays in the down position. I can move the wiper freely. How do you get the cover off to get to the motor to tighten up the arm of the wiper.

Thanks