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Q: rpms drop on 2006 Mitsubishi Endeavor

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When I am idling and turn on the defrost to the windsheild the rpms drop and the engine light flashes. What could be wrong?
(1) Answer
get the computer scaned for pending codes, the computer count how many times something has failed by blinking but if it stays on it has permanently recorded the problem, most likely is your idle control valve not respomding to the a/c compressor demand for power, yes your a/c runs when the defrost is on!