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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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