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Discussion Starter · #1 · (Edited)
I have a 2005 lly last winter truck developed rough idle the colder the weather got, when weather got hot rough idle whent away, weather is cooling down , rough igle coming back. truck runs great any have any ideas whats wrong, im thinking maybe its the fuel pressure regulatr
 

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It is possible that the fuel regulator is going bad, but first I would be sure to check the wires at the FICM bracket for wear or short. Then I would change the fuel filter, and add Diesel Kleen to the fuel tank and see if there is any change.
 

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I have a 2005 lly last winter truck developed rough idle the colder the weather got, when weather got hot rough idle whent away, weather is cooling down , rough igle coming back. truck runs great any have any ideas whats wrong, im thinking maybe its the fuel pressure regulatr
Did you ever find the solution? Having this identical problem.
 
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