Basic tune up

I just got my 2001 explorer sport with the 4.0. about 3 monthes ago. It has about 67000 miles and runs pretty well. I would like to do a basic tune up and would greatly appreciate any advice. I'm going to do the basics, plugs, wires, dis cap, pcv, fuel filter. Any suggestions on what else I should do for the tune up. Also is there anything I can do to improve my horsepower a little with out robbing from my gas millage.
All replies will be welcomed. Thanks

Change the air filter also and don't use Bosch platinum plugs because the foul easily. You could try some kind of cat back exhaust system and a cold air intake from KN filters. THat would boost power and probably give you better gas mileage.

If the truck is running well, all I would do
is change oil, air filter. and trans fluid.
Change the serpintine belt.
Don't waste youe money on plugs, or wires.
ect, for another 50,000 miles.