This happens when the car is at normal operating temp. I have reset the ecu and it still happens. actually, after reseting it the last time it now revs high(2.5K) and then low(1K) at constant. When starting, the CEL has one long flash (does this count?) and 10 short flashes. I beleieve this one indicate the Intake Air Temp Sens.. Could a bad IATS cause this problem? or should i look towards other possible problems?