I wouldn't change any other sensors or components until I did two things.
1)Run a reliable compression test. Sometimes when an engine has a lot of miles, it also has quite a bit of leakage at the piston rings. This can cause more pressure to build in the crankcase than to PCV (positive crankcase ventilation) system can releive. This can cause all sorts of "weird" problems, as the systems on todays cars "read" so many things.
2)Have someone run a complete ignition test. If you have a intermittent short circuit here, all of the problems you describe will exist.
Wednesday, July 18th, 2007 AT 4:04 AM