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Idle Air Control

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Am having intermittent problem w/ my 2000 RX300, 60000 miles. Car will not idle after first start of day, and stops immediately unless I open the throttle valve slightly. Happens about once or twice a week. Has anyone had this problem and know exactly what was required to fix? I am not into relacing a lot of parts. Thinking it may be the idle control valve actuator or less likely seeing a false signal from the throttle position indicator indicating open when it is not. I do not see a plugged idle air port causing intermiitent problems. Any opinions?



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