Welcome aboard
Sounds like a bad IAC idle air control valve, common issue with MPI. It enriches the air to fuel mixture in place of the choke. However I would expect this would be an issue when cold as well. Could be another sensor so I would have the engine scanned to look for any codes.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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