1993 Ford E-Series Van idle

1993 FORD E-SERIES VAN
350,000 MILES • V8 • 2WD • AUTOMATIC
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why dose my idle go up and down, then stables when i put in gear almost perfect?
Mar 2, 2010 at 1:30 PM
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BILLYMAC
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Hi it is searching for the desired idle. normally erattic idle or high or low are all caused by the iac motor.
Mar 14, 2010 at 7:50 PM