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Check for vacuum leaks before you go any further. If you hear a hissing noise, that's probably a vacuum leak. You can use a smoke machine (with the engine off) to pump smoke through a vacuum hose into the intake to help locate hard to find leaks.

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16y ago
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Q: 92 Pontiac sunbird convertable when its idling it sometimes varies a few hundred RPMs you tried removing cleaning and regapping the plugs but now the engine sputters under heavy acceleration what did?
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