How do I lower engine idle speed,or what part needs replacing? Rpm is 1500 on 1992 Subaru Loyale

Car is 4wd wagon, 1.8 TBI engine, it revs very low when first started then idles very high after it warms up, 1500 rpm, normal is about 700.

by in Gustavus, AK on September 05, 2012
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1 answer 2 comments
ANSWER by , September 05, 2012
Check for vacuum leak.
COMMENT by , September 06, 2012
Thanks for your reply. I have checked for that using a can of starting fluid and spraying around vacuum lines to no avail. But, I will try again as that has been suggested a couple times. I live in a remote area with no mechanics that can deal with this so I'm groping in the dark. I thought of unplugging certain components when its running to see if that shows me the component problem.
COMMENT by , September 06, 2012
Try cleaning throttle body and idle air control with carb. cleaner. GOOD LUCK.