Thread: Stumble at 1500 RPM

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  1. #1 Stumble at 1500 RPM 
    fuzzbutt
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    Default 08-02-2011
    Okay, 1998 Grand Prix, Naturally aspirated 3.8L has 100K on it,suddenly started stumbling at 1500 RPM under load when warmed up. Originally thought it was a bad tank of gas but ran Sea Foam and Chemtool thorugh it, changed the fuel filter and PCV valve. No real improvement. Maybe a bad Throttle Position Sensor or a fuel pump but it isn't throwing any codes....
    Advice!

    Thanks!

    holtrx@gmail.com
    Last edited by fuzzbutt; 08-04-2011 at 04:49 PM.
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