Originally Posted by Diseasel300

I'd start with the idle control solenoid. Sticks right out front above the coolant hose. Pull the plug off and see if you have 12V. If you do, cycle the plug a few times, you should feel the solenoid "vibrating".

If no 12V and no "vibration", there is a control box behind the glovebox that controls the idle speed. If it fails (usually cracked solder joints), the default is to run high idle (1500-2000 RPM).