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Thread: GT idling poor and stalling

  1. #1
    Junior Member
    Join Date
    Apr 2025
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    Default GT idling poor and stalling

    I have a GT that after sitting for the winter runs very poor and will stall out. No codes. Did a DOD delete, injectors, low ram intake, nick Williams 103mm throttle body and an LS7 Maf. Was tuned and ran great for several month before parking. Unable to get appointment with tuner in near future. Anyone have any insight or know of a reputable shop in Central Mass area. Thank you. I do have HP tuner but no real knowledge of what im looking at.

  2. #2
    Senior Member
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    Jan 2010
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    Southern New Hampshire
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    Welcome aboard jThib.

    This place is pretty quiet these days.

    As far as your post-winter issues, did you treat the fuel with Stabil, or something similar before putting the car away? If not, the Ethanol in the gasoline may have gummed up some of the injectors. I have been storing my G8 every winter since new. I top-off the fuel after adding the appropriate dose of Stabil. Adding it before top-off lets the fill-up mix it. And, the drive back from the gas station gets treated fuel into the injectors. I have never had an issue in the spring. You might want to try a bottle of Techron, to clear up the injectors. I doubt the tune "changed" over the winter layup.

    Hope this helps.
    2009.1 G8 GT MSM, Sport & Premium
    Creature Comfort:
    19" spare & Pace jack kit, autodim mirror, visor light mod, pass seat slider fix, subwoofer mod, Homelink visor (by Snakey),
    XM & OnStar out/CoStar BLUESTAR in, Morimoto HID High and Low beam conversion (from TRS), P275/35R19's all around on stock wheels

    Show:
    debadged except GM chicklets, custom GXP front fascia, GXP rear diffuser, Holden Center Caps

    Go/Whoa:
    VMS ECM/TCM tune, Vararam, HSRK, ARH 1-3/4" LTH, HFCs into stock mufflers, Mobil 1, Pedders Street 1 kit, front and rear Brembo's, PPV struts & shocks

    [U] Stuff waiting patiently for installation [U]
    LSA Supercharger, Staggered Camaro 20's with Holden centers, wireless Aux input for tunes off of the cell phone.

    PB: 13.468 @104.4 tune & Vararam

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