Running rough

[Ecampbell]

Hi everyone, I’ve been having an issue with my 5.9 magnum for a while now. So, when is start the truck from cold it will idle fine for about 2 minutes then start to die out at around 500rpm but it never stalls. If I turn the truck off and back on while it’s doing that it will run great the whole time I drive it. If I try to drive before turning it off and on it will run very rough and shake the truck and make loud popping noises. I’ve replaced the spark plugs, oil and coolant temperature sensor with no change. Any help is greatly appreciated!
Thanks

 

[Gr8bawana]

You might want to check the IAC valve. If it's dirty and gunked up it could cause those symptoms. Also pay attention to the tiny orifice the IAC valve controls, make sure it's clean before installing the new or cleaned valve.