when cranked it idles really high then goes back down to normal

1999 FORD FIVE HUNDRED
192,687 MILES • 4.2L • V6 • 4WD • MANUAL
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GARY CASH
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Changed the idle air control valve and a couple days later when i go to crank it, it idles real high then goes back down to normal idle. what would be the cause of it?
Nov 10, 2016 at 11:17 PM
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HMAC300
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try cleaning the throttle plate on both sides and IAC hole with choke cleaner.
Nov 11, 2016 at 6:43 AM