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What would cause high idle at around 30mph

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It does fine when starting to accelerate but around 30 mph it starts to idle high like its in neutral when in normal drive and gear 3 but in 2nd gear does fine.

Vehicle: 2005 GMC Envoy Sle 4.2

1 Answer

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The transmission may have started slipping. Start by inspecting the transmission fluid level and condition.

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