engine it will not Idle right when in park

1989 FORD ORION
95,000 MILES
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DERRICK
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89 mustang lx 2.3 4cyl.hard top. I have 89 mustang with a 2.3 The Idle goes up an down an sometime's stalls.But with the ac on it Idle's fine and the iac was replace.
Mar 24, 2012 at 9:25 PM
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RASMATAZ
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Clean and test the Idle air control and EGR and PCV valves-also test the TPS sensor-
Mar 24, 2012 at 9:30 PM