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Mine does the same thing you are saying idles high every so often (usually when I get home and are about to turn off the car..) but stock it is fine.Mine also had a flashing light, so I pulled the codes and I ended up having a bad epc solenoid. My car has some strange idle problems with the tuner also, it idles high intermitantly. Have had a few different tunes and they all do this, doesn't with the stock tune though. I'm starting to think it's a coil issue maybe. Did you have any codes Nebraska?