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I'd suggest pulling the new plugs and checking the gapping. Replacing properly gapped plugs with improperly gapped ones can cause a loss of power. And if you replaced them yourself with "pre-gapped" plugs, check them anyway. A lot of the "pre-gapped" ones are incorrect. If you are a do-it-yourselfer just pop a few out and check the gapping. If not, take it back to the garage that did the work and tell them of the problem and ask them to check.

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Q: Lost engine power on 2001 Chevy venture after changing spark plugs?
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