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Old Sep 23, 2021 | 05:14 PM
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klausd
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Engine problem
1999 f250 superduty v10 6.8, engine shakes when pressing on gas while driving, also when i am in idle it feels like it wants to die?
 
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Old Sep 23, 2021 | 05:50 PM
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Tunafish389
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Running codes would be a good place to start. If no codes, i would start with fuel filter.. But likely codes and misfires. Plugs/coils.
 
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Old Sep 23, 2021 | 06:52 PM
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klausd
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Replaced fuel filter already throws two codes cant remember off top of my head, need to change plugs haven't done that since I bought my truck last year
 
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Old Sep 24, 2021 | 04:34 PM
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Scan codes and go from there... They will point you in the right direction.
 
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Old Sep 24, 2021 | 05:20 PM
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klausd
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The codes are p0171 and p0174, all my vacuum lines are good new fuel filter, going to change the auto control idle next
 
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Old Sep 24, 2021 | 07:14 PM
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Coils and boots
 
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Old Sep 24, 2021 | 09:21 PM
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klausd
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Now when you say coils and boots isnt the boots on the coil pack?
 
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Old Sep 25, 2021 | 10:17 AM
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Yes, the rubber plug boot that is attached to the coil. Only mentioned them because I have read on iRV2.com Ford chassis forum that some owners have just replaced the rubber plug boot and it cured their misfire problem.
 
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Old Sep 25, 2021 | 12:44 PM
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Could be a multitude of problems that will cause this. Fuel trims need to be read while running to help diagnose the issue. Intake manifold leak, low fuel pressure, etc. Don't rely on internet guesses + throwing parts at the problem.

Diagnose then fix.

-- Dave
 
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