Question about GMC Sierra 1500

3 Answers

Hi I have a 1999 GMC Sierra extended cab and the 1500 v8 with the 2000 body It has a problem at any speed? it lopes or stutters around cruse and just slight acceleration when the RPMs are around 2 to 3 k?. The RPM gage can be seen moving between 2k and 2.5k with no additional acceleration. If you stomp on it or accelerate it will just go right on through it with out any issue. But it feels like it is starving for fuel or sucking air possible electrical. I just had the fuel injectors cleaned and the oil, wires, plugs, and filters replaced. Drove it 1000 miles and still have the same problem. Any Ideas it has just about 140k miles on it and other then this issues it runs perfect.

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  • cheap repair Sep 28, 2010

    is the check engine light on? if so we need the codes to diagnose

  • mikem19692 Sep 28, 2010

    It is a truck.
    1999 GMC Sierra extended cab and the 1500 v8.
    I have driven it for about 10 years. I have had it serviced by GMC for ten years.

    This is a new problem.......

  • mikem19692 Sep 29, 2010

    I have a 1999 GMC Sierra extended cab and the 1500 v8....
    The problem is it stutters or unsteady speed...
    at low RPMs on the freeway, are around 1k to 2k.

    The RPM Gage can be seen moving between 2k and 2.5k with no additional acceleration. If you stomp on the accelerator it will just go right on through it with out any issue.

    It feels like it is starving for fuel or sucking air possible electrical.

    I just had the fuel injectors cleaned and the oil, wires, plugs, and filters replaced.

    Drove it 1000 miles and still have the same problem.

    Any Ideas it has just about 140k miles on it and other then this issues it runs perfect.

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Hi,

Could you tell me if the MIL light on the dash is flashing, or if you have got any fault codes from it.

Please let me know and we can get this sorted for you.

Thanks

Jason

Posted on Sep 30, 2010

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Hi! The problem will surely be on the MAF (mass air flow) sensor. The MAF has big contribution on engine performance specially on the idling and vacuum supply. If the MAF is faulty the performance fails. Have it replaced and you'll be good. HOpe this helps and thank you for using FixYa!

Posted on Sep 29, 2010

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I sure wish that you would say what kind of truck or car you have. as theirs more than 1 V8. You say the engine is a '99 and the body is a 2000? Has the truck ever run right since it was put together this way? Being the engine was changed let's say the engine changer did'nt finish his work. Their's lots of ground wires that go from different parts of the engine to ground, on the body. Back of the cyclinder head to the firewall back of the cyclinder head to the bolt that holds the engine to the transmission are many times left off. theirs also two black wire harness wires that go a this same bolt. theirs also a wire ( black) that bolts to the intake next to the therostate housing. theirs a blck ground wire that connects to the back of the altenater. theres a place on the distrubuter, to connect a ground wire, they don't always have one there but connect one anyway till you find the problem. the engine even though it seems like one big block of medel may not be connected all together as you might think, add ground wires till you find what works the tach climbing or changing with out the engine changing is always extra voltage and a well grounded engine won't do this. Unplug the altenater and run it and with the altenater off if it's fixed youknow whats not grounded good enough.

Posted on Sep 28, 2010

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