Question about 1989 GMC Sierra

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I have a 1989 gmc sierra 1500 4x4 it runs perfect in park when it is just sitting but when you drive it it cuts out real bad it want let you give it a lot of gas if you push gas down hard and quick it cuts out and falls flat on its face and a lot of times lets out a very loud back fire sounds like a rifle shoots flames out of both tailpipes and want hardly pull itself runs very ruff but when you come to stop it runs perfect

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  • GMC Master
  • 21,873 Answers

Is the check engine light on ?
Have you checked base fuel pressure with a gauge ?

Posted on Apr 19, 2013

  • charles edward berry Apr 19, 2013

    it comes on once in a while a buddy of mine has it he said yesterday that he put a fuel pressure gauge on it and drove it a little bit and it stayed a consistant 10lbs of pressure he put new plugs wires distibutor cap coil a throttle sensor and a couple of other sensors and new in line fuel filter nothing is working when the check engine light comes on it doesnt stay on long

  •  Stephen
    Stephen Apr 19, 2013

    I would check the computer for trouble codes anyway. Could be several things like a leaking EGR valve and so on.


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Posted on Jan 02, 2017

old marine
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SOURCE: 1999 Gmc Sierra has no power

Sounds like the fuel supply is inadequate. Check for a plugged fuel filter, or possibly the fuel pump is losing pressure. I had a 93 Chevy V6 that acted the same way, and after checking everything else I replaced the fuel pump, which solved the problem.

Posted on Jun 10, 2008

  • 231 Answers

SOURCE: 89 GMC Sierra problem

there is an ignition module located rite beside the distributor cap on the distributor base these are well known for getting weak and heating up thus causing your engine to stall.

Posted on Oct 15, 2008

  • 393 Answers

SOURCE: engine stalls when acceleration

sounds like poss throttle pos sensor prob./ could also be problem w/fuel pump not pumping enough fuel at high speed. poss fuel filter clogging also. have someone check pump pressure.

Posted on Nov 11, 2008

  • 23 Answers

SOURCE: Tailpipe BLACK , exhaust reaks of gas !

garage mans company.
broken plugs.

Posted on Mar 12, 2009

  • 3854 Answers

SOURCE: 99 gmc sierra... seems like the abs is taking over

It sounds like it's the ABS module has gone bad, your going to have to take it to the dealer and have them service it. There are special tools that the average person don't have in there tool box. You can go to Auto Zone and see if there are any DTC codes, but if there are no light on the dash. It may not show any and the dealer will have to test the module. Good luck and hope this helps. keep me posted, be glad to help.

Posted on Jun 09, 2009

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89 GMC Sierra problem

there is an ignition module located rite beside the distributor cap on the distributor base these are well known for getting weak and heating up thus causing your engine to stall.

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