I can't help much, but I'm having the exact same problem, and I replaced the map sensor and the O2 sensor. My mechanic said it might have something to do with the thermostat, but he's checked that and he said it was fine. He's also greased a module, which help a little bit, and we regapped the spark plugs, worked for about a day.
My temperature gauge isn't moving out of the checkered zone, is that the case with yours as well?
Wednesday, November 19th, 2008 AT 5:49 PM