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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Fast idle

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Old Jan 1, 2026 | 06:01 PM
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kingary49
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Fast idle

93 F150, 5.8 liter, E4od. When I put it in park, the engine doesn’t idle down. Have to kill it with engine racing. Any thoughts on this, I don’t see anything mechanically wrong. Maybe an electric problem.
 
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Old Jan 1, 2026 | 06:28 PM
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Sounds like a large vacuum leak. What happens when you unplug the idle air control motor?
 
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Old Jan 2, 2026 | 08:48 AM
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I’ll check that out! Thank you!
 
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