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Showing results for tags 'stumble'.
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I have a stumble only at idle or when first accelerating from a stop, the engine rpm will stay around 500 then dip for a second to maybe 300-400 it isn't consistent and sometimes feels worse than others, you can feel a slight stumble when you first leave a stop but after that it's fine, smooth and no lack of power. The MAF and throttle body have both been cleaned properly but neither made any difference. The engine has about 205k on it, the plugs have about 80k on them now. I'm not sure where to look next ?
2000 GMC Jimmy 4.3 Vortec 4WD ~215,xxx Engine starts, runs/revs in park but will stumble and miss off idle in drive. It wont stumble all the time though, sometimes it will run perfectly fine. Occasionally while driving in overdrive the engine will lose power, throttle does nothing, and drop to idle and begin stumbling and backfiring. After this happens if you let it sit for a few minutes it will start and run fine. Also this loss of power only occurs in overdrive, if I drive around in 3rd it runs fine. Fuel pump was replaced ~3 years ago Fuel filter ~3 months ago IM gaskets ~5 months ago (due to a coolant leak) Radiator ~8 months ago (cracked) Had codes pulled p0101, p0151, p0717, p0174 Anything you guys have would be great! Thanks!