1990 Ford F-150 Rough Idle Stalls

FORD F-150
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SHEENIST
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I have a 1990 f150. It developed a rough idle on cold start up which progressed to rough idle and stalling all the time.it will only stay running when i keep on the gas.I was told that it could be a battery problem so I replaced it. Before I replaced the battery it ran ok at highway speeds,now after the battery replacement it sputters at highway speeds.Any ideas?
May 26, 2006 at 10:04 AM
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LOSONE
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It is probably the idle air controller whcih is the silver thing on top of the intake plenum. Remove and clean it. It is a little better but not right buy a new one Good Luck
May 26, 2006 at 11:01 AM
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Suggested Repair

Remove and clean the idle air controller on top of the intake plenum. If cleaning helps only slightly, replace the idle air controller.

Conversation Summary

The owner of a 1990 Ford F-150 reported a rough idle that progressed to constant stalling unless the throttle was held. Replacing the battery did not fix it, and the truck then began sputtering at highway speeds. The expert said the idle air controller on the intake plenum was the likely cause and recommended cleaning it, then replacing it if cleaning was not enough.

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