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Hi, Check for any Vacuum leaks. This can cause for engine to idle high or even rough. One other thing is a bad idol air control. Hope that helps. Go to your mechanic and have him do a computer code check.
If your idle is too high it can mean a few things with computer controlled engines. Most common problems relate to the sensors in your throttle body being dirty or faulty. If after your disassemble your throttle body and clean the throttle body and sensors you still have the issue you can adjust your idle through the Idle Adjustment Screw.
Idle problem like what? too low? too high? If it is too low it could be because your air filter is way too dirty or the throttle body has a bunch of carbon built up in it around the butterfly valve and gets no air at idle. If it is too high you have a vacuum leak. air sucking in from a cracked hose or intake manifold gasket. Check all your vacuum hoses and spray carb cleaner around the intake manifold gasket while the car is running.
check for air leaks on the emission system, if fine, check for the throthle posittioner disconect it, if idles good, replaceit, next go to the idle motor, is next to the throthle body, remove it and clean it with a good carburator cleaner, install it and start the car.
good luck.
High CO usualy means the O2 sensors are not reading properly. Take it to a parts store that can read codes, I know Auto Zone does in my area. If it is the O2 sensor it is an easy fix but the sensors run about $50.00 each.
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