Po Code 507 IDLE SPEED CONTROL VALVE followed by a PO 300 Random Misfire
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Joined: Mar 2009
Posts: 8,453
From: Belleville, Michigan
Do you know if the throttle stop screw has been moved? Very small torx screw on the passenger side, front, top of the throttle body. If it was screwed in, it will raise the idle too high. It should not be moved from the factory setting.
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