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The ECU should bump the idle speed to compensate for the drag of A/C compressor when the A/C is running. What year, model C900, and transmission do you have?
Does the engine RPM drag down and not recover when significant consumers like the cooling fans kick on?
Swapping the IAC valve for a known good unit is a good place to start. And it's easy.
Let us know how it goes.
Chris
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