02 1500 with 4.7.
After starting it and start driving after a few miles it wants to try and die unless I keep my foot on the gas slightly and keep rpms up.

 

Clean the IAC thats on the throttle body. 2 screws and its off and then clean inside the throttle body they tend to get carboned and the IAC sticks causing the air mixture to not work properly and the engine idles up and down.