In general, a tune up would include spark plugs, plug wires, distributor cap, rotor, fuel filter, air filter, and PCV valve. Some of the parts mentioned may have already been replaced like the air filter. However, it should be checked and make sure the belts and hoses are in good shape.
Let me know if you have other questions.
PS: I have the same truck. 220K and still going strong.
Friday, December 4th, 2009 AT 9:45 AM