3.0 U code sporadic high idle and miss at speed
Hey all - I have an 02 Merc Sable wagon with the pushrod 3.0 liter. It has a "stutter" for lack of a better word when crusing at a consistent speed. It does not seem to have to be under a load to do it, although it is worse under a load. Also when pulling to a stoplight and taking your foot off the gas, the car actually accelerates, and idles high in park/neutral. I have cleaned the IAC, MAF and pulled the plugs, cleaned and checked. Wires appear to be good and there are no vacuum leaks. Anyone have any ideas, any help is appreciated!