03 base model Vibe w/ auto trans...No CEL displayed on dash...
Once the car has been driven for a while and the engine is up to temp, the temp gauge falls from Normal range (mid-gauge) to ZERO.
When in falls, the car stutters and hesitates when trying to accelerate.
If i'm sitting at idle (parked) and the Temp Gauge drops, the idle definitely goes way up!
So I know the computer reads the Temg gauge at zero (cold) and puts more fuel and ups the idle believing the engine is cold (which it is not).
any idea what is causing it and possible fix actions to take?