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?
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.