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A dirty or clogged air filter would cause excessive fuel consumption, and it could cause the engine to surge, but I'm not sure about the drop in your alternator guage.

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Q: What would cause excess fuel usage surging lagging whether running or idling and a drop in battery needle with each lag?
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Is there a way to determine whether it is your battery or alternator that needs to be fixed in a 2001 Bonneville?

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