1997 - 2003 F-150

Rough idle, out of ideas

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Old Sep 18, 2021 | 06:16 PM
  #1  
laneman's Avatar
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From: Texas
Rough idle, out of ideas

99 4.6W with 267K miles. Tried several things so far, looking for other ideas to fix rough idle at stop light. I did new plugs, wires, coils, cleaned entire intake assembly including IAC and all passageways, new air filter. What's next to try?
 
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Old Sep 18, 2021 | 08:29 PM
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glc
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From: Joplin MO
Techron in the gas to clean the injectors. Compression test.
 
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Old Jan 6, 2022 | 01:57 AM
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Vaccum

Vacuum is my guess but did

​​​you sync the coils?
 
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