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  1. C

    5.3 runs very rough under load

    400 parts and labor. since they were welded in I didnt attempt it. Didnt want to try to cut out and piece it back together.
  2. C

    5.3 runs very rough under load

    after terrorizing the neighbors by unhooking the exhaust it proved to be both cats plugged big time. After a a morning in the exhaust shop its back to running like a champ. Thanks to all those with their advise.
  3. C

    5.3 runs very rough under load

    So had some other things to do and had the battery unhooked for a couple hours. When I hooked it back up the only code I have now is the P0440 (gas cap) code. The truck is running a little better, I would say about 25% better. I can accelerate slightly faster than I have been able to...
  4. C

    5.3 runs very rough under load

    Going to track down gauge tomorrow, didnt find one in our little town today. In reading about both of the error codes everything I have said so far that neither sensor should have much of an effect on drivability, but maybe both together I guess. Had forgotten how long since fuel filter...
  5. C

    5.3 runs very rough under load

    So I finally got decent weather to test some things out. The codes it has are for P0178 Flex fuel sensor and P0441 incorrect purge flow. According to autozone's whizbang computer troubleshooter that points to a bad fuel tank preassure sensor. Not an expensive part but Im not yet sure I have...
  6. C

    5.3 runs very rough under load

    Thanks for the feedback. Soon as it warms up a little I will get out and give them a look see.
  7. C

    5.3 runs very rough under load

    2002 Tahoe 210,000 miles. Engine starts right up and idles smooth in park. In park engine revs freely with no hesitation or noise. In drive the engine is smooth if you keep the throttle low enough to keep RPMs under about 1800-2000. Give it any more throttle and the engine vibrates, has no...

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