My car pulled off a great performance at the track friday, times in sig, so I think it's about time for a tune up. Here's what I plan on replacing:

spark plugs
spark plug wires
distributor cap
distributor rotor
fuel filter
pcv valve
oil filter
crankshaft seal
camshaft seal

Is there anything else I need? The car has got almost 90k on it, and the timing belt was replaced at 62k by the previous owner. Is it time for a new o2 sensor also?

 

clean the throttle body and maybe run some engine cleaner or something through it.

 

also, in addition to my crappy track times, I've been getting some bad gas mileage, about 230 miles to a tank. Could this be an o2 sensor?

 

The crankshaft and camshaft seals are a b**ch to change, you have to remove the timing belt, and the cam pulleys and then pry them out. If they aren't leaking then there is no need to change them, it will not help performance and if the t-belt was changed 30,000 miles ago, then it's pretty likely they were done with it. 230 miles a tank is horrible man, it could be a number of things that you are replacing and I would replace the 02 sensor also. Your car looks nice with the 01 wheels, I should be getting mine in the next couple weeks. Good luck with decreasing those track times.