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

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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.
(1) Answer
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.