Idle not right

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Holt50

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97 gmc yukon 4x4. 326,500 miles. Sometimes idle jumps up when stopping and putting it in gear. Or when coming to a stop it stays up for a couple seconds and goes back to normal in gear. Would like some input please on wtf is going on. Thanx.
 

TigerEyz3

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Not saying this is where your issue is, but something to think about:
  1. Possible vacuum leak
  2. Have you ever done any injector/intake gasket work? Assuming not, it could also be your fuel "spider". They are known to get brittle over time. If/when replacing, go for the upgraded MPFI fuel spider and the upgrade intake gasket set. The upgraded spider replaces the poppets with actual injectors at the end. The upgraded gasket set has metal inserts that make the gasket less prone to crushing and leaking. Replace them at the same time and you won't have to fool with them again.
 

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