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Your idle microswitch may not be activating. Its the plug by the throttle body that has a two pin connector on it. Use a test meter to check that it activates closed when the throttle is closed. If not working, the switch may either need to be adjusted or the linkage may be too tight. When the switch does not activate, the computer will think it is in part throttle mode, and want to idle up at 1500-1700 rpm.
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