Question about 1999 GMC Yukon Denali

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Unfixable Denali I have a 1999 yukon denali, It Runs ok in my driveway until I push the gas, when i am driving it no matter how hard i push the gas it goes very slow like 15mph I have replace the O2 sensor, cads, the fuel pump, fuel filter, the mass air flow sensor and and fuses. I dont have a cule what is wronge with it i have replace all these things in it because i was told that that is what was wronge with it now some one is telling me that it is the fuel pump again but i put a new one in it and it was doing the same thing nothing i do to it fixes the problem. I dont know anything about cars should i have some one replace the fuel pump again im tired of my truck sitting in the drive way like it has for the past 7 months. i also wanted to know how much fuel pressure it is supposed to have i want to check that before i buy a pump.

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  • brendafv23 Feb 12, 2009

    Thanks I'll try the spark plug thing, the other day i was going to take it to auto zone when i started it the check engine light was on but by the time i got there it was off. it ran fine going but on the way home it started being stupid again

  • brendafv23 Feb 25, 2009

    Update I put it in the shop a week ago, Its still broke, I talked to them today they said they put it on the computer what came up on it was mass air flow i think what ever it was they fixed it and its still doing the same thing they are at a loss, someone told me tonight that it could be the gas cap lossing pressure. could this be whats wronge with it?



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Locate the coil pack.... pull one spark plug wire at a time... any change in how the motor runs ... replace it and move to the next wire. if you pull a spark plug wire and there is no change you have likely located the problem.
a couple things... if the check engine light is on stop into autozone and have them read the codes (free) also another possibility is a plugged catylitic converter.


Posted on Feb 12, 2009

  • Roberta Smith
    Roberta Smith Feb 12, 2009

    i believe they can still retrieve the codes up to three key cycles (on and off)


  • Roberta Smith
    Roberta Smith Feb 25, 2009

    check the coil pack... at the coil pack... pull a spark plug one at a time... any change in idle ?... plug it back in and move to the next spark plug lead... if you find one or two that don't have a spark change the coil pack. also check from the air filter to the engine for any air leaks. you may be able to hear the noise.




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