Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance Post to end my other posts

I agree the back three can be accessed easily with the aid of extensions. The hardest thing is removing the plug wires because of the cramped quarters but it can still be done without much trouble. I just did this last week because I was experiencing the same problem as you. I pulled my plugs and checked the gap, made sure all were .054". I also cleaned the MAF sensor and IAT sensor with 3M non-chlorinated brake cleaner, even thought them didn't look dirty. At the same time I reinstalled my factory airbox and added fuel injector cleaner during my last two fill-ups. In late summer I had done a complete UIM/LIM cleaning so I didn't bother checking them. The result for me has been greatly improved milage, I expect to get between 310 and 340 miles on this latest tank of gas which has been a 50/50 mix of highway/city driving and for the most part keeping the RPM below 3000. That is good for me considering the colder weather we are getting now. FWIW I also changed from Sunoco Ultra 94 to Shell 91 octane fuel as a test, I am happy with the results so far.