I have found on my MH (ISB 300hp) that sometimes, on initial start up/running with the cruise set, the idle is not high at the outset when the engine is really cold, but within a few minutes, the idle increases. Maybe mine is faulty, don't know, but if not, that may be what you are experiencing.
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Larry, Eileen, and Finley
2004 Alpine 36FDDS
Third motor home, first Alpine, no need for another.
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