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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1973-1991 Ford F150

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Old January 5th, 2018, 11:00 PM
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1victoryrider 1victoryrider is offline

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Angry Fast Idle problems on '88 F150/302

I have replaced TPS, IAC, removed and cleaned throttle body, and changed over to all rubber vacuum lines but engine still idles around 1500-2000 rpm. What next? Intake gaskets? I also noticed (in a diagram) there is an additional vacuum tree under top intake. I heard of one guy plugging PVC hose and covering throttle body to see if engine died. If not there's a definite vacuum leak? would appreciate any help
Old January 6th, 2018, 11:02 AM
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What happens if you unplug the IAC?

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS

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