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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Rough Idle

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Old Oct 24, 2001 | 06:50 PM
  #1  
Hausladen's Avatar
Hausladen
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From: Howard Lake USA
Rough Idle

My truck idles real rough, the idiling stays at about 1000 rpms. Once it warms up some times it will all of a sudden jump up between 2000 and 2500 rpms, then it will go back down and be fine, then all of a sudden it will jump back up.

It is a 1984 F150 4x4 300 L6, 4 speed manual.
 
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Old Oct 25, 2001 | 06:36 PM
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From: arkansas
Rough Idle

 
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Old Oct 25, 2001 | 06:38 PM
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mavman
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From: arkansas
Rough Idle

remove the air cleaner assembly, grab the carburetor and wiggle it. It's probably loose (common on these engines). Tighten it and see if that helps.
 
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