any codes in the computer. Missfire codes can determine which cylinder you have concern with. Pick up a code reader at your local parts store, some even will read your truck for free.
Otherwise hold it closer to your lap top so we can see it clearer, it is a bit out of focus.
Thought about it and suggest you check the fuel pressure, pump may be going out, clogged fuel lines, filter picking up trash. Could drop the tank and clean it out or put some magic in a can in the gas tank.