96 trooper won't idle below 2100rpm??

Trooper started normally, put it in gear this morning and idle jumped up. Out of gear it now idles at 2100 rpm. Runs fine put idles at 35 mph in OD.. GAG. What would cause the instant increase in idle speed? Ran perfectly yesterday, runs perfectly today except for the idle speed. No engine lights?? Any ideas appreciated.

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arlon
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