Question: Hello, I own an 87 4 cylinder Fiero and I seem to have two problems. First is when idling at stop lights/sign and what not the engine seems to jump up and down from around 550rpms to about 800rpms. It doesn't do this in park only in drive. Second is on hot days the first time I start it up in the morning it will occasionally stall and quit on me. It is not everytime but has happened several times, and then on cold days when I brake the engine will almost die out but come back, and occasionally it will die out completely.
Answer: It sounds like you have a malfunctioning coolant sensor, or if an auto no signal to the ECM from the neutral safety switch that the car is in gear. A scan of the ECM should tell what is wrong.
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