Rough idle

[William Hamrick]

so I have 05 4.7 1500 . No codes thrown , new spark plugs and coil on plugs. So I can start the truck let it idle and it’ll do fine . After I drive it and park it though the truck Rpms will idle up and down from about 600 rpms to 1000 or so . It’s done that to the point of dying as well . Not sure what to make of it

 

[Nick_rp]

start easy, check the air filter and housing make sure they are clean

-look for vacuum leaks, broken/collapsed hoses, around seals/gaskets

-PCV pinch off the vacuum supply line to the PCV, if it smooths out, replace it with OE

-MAF, clean probe

-power balance test

-restricted exhaust

-the rest of the control sensors, check last with no codes