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G1500

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When I start my truck it's idling high and when I'm driving the rpm fluctuate up and down and the transmission doesn't want to

Hello. It sounds like you may have a vacuum leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak). This engine is notorious for vacuum leaks from a bad intake manifold gasket (https://www.yourmechanic.com/services/intake-manifold-gaskets-replacement). This is very common. It can also be from the MAP sensor (https://www.yourmechanic.com/services/manifold-absolute-pressure-sensor-map-sensor-replacement) or a...

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