I have a 92 Ford F150 that is causing me to have problems. when you hit the accelerator the truck runs great. But when you are just pushing on the gas just far enough to keep your speed the same. The truck will start to act like it has a miss in it.
So what is going on can any one help me please.

 

How are your spark plugs, wires, rotor, and cap?

 

I have changed the plugs, wires and the full cap unit.