High and low idle in 2001 Mazda Protege?

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cello10star

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My Protege has about 140,000 miles and I have trouble with low and high idle. It's a manual transmission, and when stopped I sometimes get high idle and sometimes low- and sometimes it's just fine! The car never stalls, and high idle is about 2000rpm. What could cause the randomness in the idle speed?
(and more importantly, how much is this going to cost to fix?!)
 
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