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Thread: 5.3 help

  1. #1
    Tuner in Training
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    May 2020
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    5.3 help

    I have a 5.3 with a btr stage 3 cam, with FF injector, long tube headers, 4.10 gear, and the trunnion kit installed. It ran good before I put the FF injectors in and now I have to hold my foot on the gas to get it to idle and it also does rev up fast at all. also when I give to gas and let off of it to go back to idle to just idles down and dies. can anyone help me out? Thanks in advance.

    devs truck.hpl

    Devins truck 2003.hpt

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
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    Rogers, MN
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    You should probably change the injector data because that tune file shows that you didn't.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuner in Training
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    May 2020
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    Devins truck 2003 with FF injertors.hpt
    I just tried this one after changing the injector stuff and it does the same thing

  4. #4
    Senior Tuner
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    Mar 2011
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    Ripley, MS
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    It's in MAF only mode. Make sure your MAF is properly installed with no leaks. Or, you can do an SD tune and disable the MAF.