Originally Posted by cyndi335icoupe
Thanks to all that reponded. The dealer cleaned the valves in cylinders 4-6 and changed the plugs and the problem went away. I guess they pull the intake manifold and clean from there. Said it was a common problem if the car was driven to easy, (low rpm high load).
What do they mean with "low rpm high load"? Under 1000, 1200, 1400,...