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if you already did a tune up, make sure you have the correct firing order. Ford made 2 different 5.0 one was for the mustang another for the truck. the mustang 5.0 firing order started 1,3,7,2,6,5,4,8 the truck firing order if I can recall correctly started 1,5,4,2,6,3,7,8. also might want to check or replace fuel pump.
On american cars the firing order is imprinted on the engine itself, if not the firing order is located in your owners manual it will also give u gap specs as well. Make sure the gap is right and firing order is right, If they are both correct then you might need look into your distributor or coil whichever ur case may be. If all this is correct, check and make sure ur wires aren't faulty and fouling out against metal or the brackets their mounted in. This is rare but it does happen sometimes.I hope i have helped you