A dirty throttle body might be the problem. Or check the IAC (Idle air control). More than likely its a dirty throttle body which is not that big of a deal to get it clean. Hopefully its not the IAC. That will run you a couple of hundred dollars.
I will talk about fuel injected engines since they have been common on most cars since 1987. Idling problems could be several problems. A dirty idle air control motor , dirty mass airflow sensor or dirty air filter will cause idle problems. Spark plugs that are wore out will cause a cylinder to now fire correctly. A wore or sticking injector will cause idle problems. The most common problem I find as a mechanic for idle problems is a faulty coolant temp sensor. So the three major systems to check are the AIR, FUEL and SPARK .
I don't believe you can change the idle if it is fuel injected, the idle is controlled by the computer, one of the most common problems with low idle is a faulty (IAC) sensor, Idle Air Control. I don't know if you can check these or not but they are available at your local parts store, they usually have a diagram on their computers to show the location of these sensors. Hope this helps.
Idle speed is computer controlled and is not adjustable. Is the speed is incorrect, you have a malfunction with the idle airflow control motor, another sensor, or the computer could need reset. A weak battery can cause the computer to "forget" how to idle. Unhooking the battery for five minutes resets that.
This engine will be fuel injected. This means that if the engine will not idle at the correct speed there is something wrong with the fuel injection system. The most common problem leading to a high idle is a vacuum leak. The second most common problem is a bad or fouled spark plug If neither of these is the problem a scan with a correct tool may tell what component has failed .
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