I actually did that fix already. I have the fortune of having Resident engineering in my back yard. That is what they wanted me to try but did not take care of problem. There was also a problem with the wires going down to the coils were assembled too short causing the wires to rub on the side shorting it out. Caused it to backfire also. But unfortunately I ended up being right. It was just poor maintenance by the company. I fell for the we just did a tune up a while ago. After going through the motions I checked the plugs and all the amenities and figured out I was temporarily an idiot for listening to them. Made the repair and Vuala<--(sp?).