1988 k3500

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09-20-2018, 09:35 PM

88gmc

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1988 k3500

I have a 88 gmc k3500 when I press hard on the brakes while in park all the gauges go down idk if they do while driving truck had bad trans putting one in soon but the radio lite dims All gauges go down but truck still runs so any idea what it could be. Thanks

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09-21-2018, 12:22 AM

CathedralCub

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Quote:

Originally Posted by 88gmc

It has hydroboost, right? It could be the power steering pump dragging the engine down. What does the engine slow down to when you're doing this?

What engine does it have?

Is it the 87-99 body or the 73-87 body?

How many miles on it?

How old are the spark plugs?

How old are the wires?

How clean is the air filter?

Is the check-engine light on?

What voltage is the electrical system showing at idle (with a real meter, not the dash gauge)?