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Finished upgrades.. car stumbles with throttle

This is a discussion on Finished upgrades.. car stumbles with throttle within the General Help forums, part of the LSx Technical Help Section category; I am trying to help my brother with his Camaro. He's not very good with computers so I'm on here ...

  1. #1
    Junior Member
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    Jun 2010
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    KC, KS
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    2002 Camaro SS

    Finished upgrades.. car stumbles with throttle

    I am trying to help my brother with his Camaro. He's not very good with computers so I'm on here for him. We just finished doing some upgrades on his camaro and we're not sure what to do to fix it now.

    2002 Camaro SS 5.7L
    228 Comp cam
    Patriot stage 2.5 ported heads
    FAST 90mm intake & TB
    roller rockers & hardened pushrods
    ls7 lifters
    off brand SS 1.75" headers
    Magnaflow exhaust with cutout and offroad y-pipe (no-cat)
    stock 28# injectors, stock tune, stock fuel pump, stock coils
    Taylor Wires
    Bosch Fusion Plugs

    Car starts & idles without problem @ 900 rpm. As soon as you give gas the car stubles and almost dies. It is pretty much not driveable at the moment. We're obvious that it needs a tune but in it's non driveable condition we can't get a good tune done to it.

    Thank you in advance for any help you can give

  2. #2
    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
    2004 GTO M6

    You will need a tune once you do a cam swap. PM our sponsor/tuner Frost. He can help you out.

  3. #3
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    pajeff02's Avatar
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    Black & Blue
    '02 WS.6 / '07 Suburban

    +1 You have changed lots of things that affect the airflow through the engine. The fueling is going to be way off and he'll need a tune to compensate for the changes.

  4. #4
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    +2 Frost mail order tune should get the car driveable. Check out the sponsors page and look for Tuned By Frost

  5. #5
    Junior Member
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    2002 Camaro SS

    Thanks for the suggestions. We'll get a tune done asap and see where it takes us from there. We were hoping that we didn't have to replace injectors / fuel pump.

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