I have a Ford F-150 4.6 V8. The RPMs has started to surge up and down while driving at a constant speed. If I take it out of overdrive it doesn't surge. It starts fine and no missing. Changed the fuel filter today. No change. I have a K& N air filter. I also cleaned it with their kit. No change.
Saturday, November 3rd, 2012 AT 8:50 PM