[OverBoardProject]

Just a couple of guesses.
Coil
ignition modual
burnt out plug wires
bad spark plugs

Try looking into a shop type manual (haynes or any other brand)
Just about any ford the same year will have the same basic parts and methods of testing. Although they might look a little different.
Just follow their test instructions and you should be fine

The cost of just some of these parts will quickly add up to more money that getting a mechanic to just find the problem for you.