When I drive my truck after it's been sitting overnight or sitting more than1 hour it feels like a cylinder or two are missing. (4.9 6 with a 4 speed) It only does this for about a 1 mile then it quits and drives normal. I thought it was the fuel filter the way it was driving. I replaced that today and it still does the same thing. I put in a new front tank fuel pump about a month ago. It does this when I'm using the front tank or back tank. So now it's making me think it's electrical.
I drive most of the day to and from job sites. As long as I am in and out driving most of the day it does not do this and drives fine.
Any thoughts? Has anybody had this problem? Thanks

 

Condition of plugs, wires, cap & rotor.

 

Thought of that after aI posted. I bought a new cap and rotor. Still does the same thing. I'll try the wires next.