why do the RPM's race?

2000 MAZDA PROTEGE
110,000 MILES
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MAZDA2000PROTEGE
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2000 mazda protege with 1.6L 5speed, when cold it runs great but once warm the RPMs rev up and fall almost cutting the car off. i checked for vaccum leaks, and found nothing. but when i pull off the vacuum line coming off the intake manifold going to the solenoid between the manifold and the canister. it runs great but with a loss of power. so i replaced the solenoid between that line and the canester. and still the same thing. plz help
Sep 14, 2011 at 9:43 AM
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KHLOW2008
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Have the throttle body and IAC cleaned and retest.
Sep 14, 2011 at 4:26 PM
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MAZDA2000PROTEGE
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ok,i want to start by saying thank you for helping... i cleaned the throttle body and IAC. but still having the same problem. do you know of any thing else to check?
Sep 15, 2011 at 4:12 AM
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KHLOW2008
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Have the valve clearances checked to see if they are within specs.
Sep 15, 2011 at 1:12 PM