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  1. #1

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States

    Default Boggy engine on 1999 5.3

    I have replaced the front O2 sensors, fuel pump, fuel pressure regulater and the fuel filter. After the truck has sat and completely cooled, upon start up it really boggy when trying to get going from a dead stop. It also just doesnt seem to have the high end that it should and once did, when attempting to pass a car on the highway. It for sure doesnt have the passing power and take off that my 99 suburban has. i have no toher codes showing and am windering what else it could be. Start of the intake gasket going???? I still get 17-17.5 mpg on the highway even with the bigger mudd tires on it, so this is really confusing me........
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual

  2. #2
    Sr. Engineer
    Join Date
    Oct 2010
    Indianapolis, In


    Does the installation of the bigger tires happen to be about the same time your performance issue showed up?
    2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear

  3. #3


    Try replacing the mass airflow sensor, i had the same problem with my 97.

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