With the advent of platinum tipped spark plugs and distributorless ignition a tune-up doesn't consist of much. Air filters (engine and cabin if equipped) should be replaced at 30k mile intervals (more frequent if in dusty climates). Spark plugs and PCV valve should be replaced at 100k mile intervals. The fuel filter is built inside the tank and is designed to last the life of the vehicle.
So basically if your at 100k miles you should replace the air filters, pcv valve, spark plugs and wires(if equipped). That is the extent of a "tune-up" now a days.
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