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Q: How do I sto p the engine from cutting back or skipping? on 2001 GMC Yukon XL 1500

The check engine light comes on along with the engine skipping or cutting back on hills.
How do I stop the skipping and cutting back on the hills.
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It sounds like you have an engine misfire under load. With the check engine light on a fault code is stored in the power train control module. Reading the codes stored in the pcm should help get to the cause of your misfire.
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