1999 Chevrolet 1500 Engine RPM Too Low

Reader Question: Hello,

I have a problem concerning my 1999 Chevrolet 1500 HD. My problem is when I drive sometimes it like stops running sometimes. However, I know it is not the battery and the alternator.

When I start it up, I kinda runs very low on RPM’s around 500 maybe. I thought it would have been the fuel filter clogged off but I replaced it and that is not it either. Therefore, what is my problem and where should my RPM’s be running at when in park or neutral?



Hey Justyn,

You might have a weak electric fuel pump. Next time it dies or acts up, have someone bang on the bottom of the fuel tank with their fist or a rubber hammer as you crank the engine over. This can jump-start a weak fuel pump.

If the engine runs better or the RPMS are affected by the banging you most likely need a new fuel pump.

I would expect your base in park idle speed to be about 900 and in neutral about 800-850 could be higher with the AC compressor on.

Austin Davis

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