1990 Ford Aerostar ENGINE REVS UP AND DOWN IV ALL SPEEDS

1990 FORD AEROSTAR
160,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MIXER11
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ENGINE REVS UP AND DOWN IN ALL SPEEDS LOPES WHEN IDLEING AND DIES
Sep 27, 2008 at 2:27 PM
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MMPRINCE4000
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Remove and clean the Idle Air Control Valve, the pintle on the valve and the base.

I would also check for any vacuum leaks.

I would also check the fuel pressure witha mechanical gauge and change fuel filter, if it has been longer than 1 year.
Nov 11, 2008 at 7:58 AM