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Could be a number of things. Start by looking for vacuum hoses that are old, cracked or broken. Could be a simple fix. If nothing there then looks at your idle air control valve. You can unbolt it and unplug it. Look inside at the "plunger or actuator". It could be covered in carbon deposits and be sticking, or not working at all. Try cleaning it with engine degreaser and hose off cleaner with water. You may have to scrape some of the carbon off with a small screwdriver or tool. When cleaned, spray inside with WD-40 to lubricate and displace any remaining water. If that helps or fixes the idle problem it would be a good idea to replace the idle air control valve. Around $150 to $200 at your local parts store. Other possibilities are bad MAP sensor, bad mass air flow sensor, O2 sensors or fuel pressure regulator. Is your car throwing any codes? What are they? Check engine light on?
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