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high idle

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5.0gt:
i have a 1988 gt with a 5.0 and the idle seems high to me it ranges from 1000 to 1500 rpm the timing is at 12 degrees and there are no vacuum leaks any suggestions?

Soaring:
It could be a lot of things.  See if this article helps lead you to the problem. 
http://mustang.blogsome.com/2005/10/10/50-idle-adjustment/

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