I am trying to do a tune up on my own on a 2000 Mitsubishi Eclipse GT because they are too expensive to take somewhere and have done. How do I do this

OK, i have put a step by step check list for you to follow. this will lead you through the vitals and secondary tune up sections that will ensure optimal performance. The list reads as follows.

Step1
Replace the fuel filter. If you have a fuel-injection system, regular cleaning isn't necessary unless the injectors are clogged.
Step2
Change the spark plugs (unless they're platinum, in which case you have 30,000 more miles to go). Also examine the spark plug wires and replace as needed. A new set of high-quality wires is worth the cost. They may be permanently attached to the distributor cap, so it will have to be changed as well.
Step3
Replace the distributor cap and rotor if your car has them (some newer models with distributor-less ignition don't).
Step4
Change the points and condenser if you have an older car (roughly 1978 or older) that doesn't feature electronic ignition. You'll actually want your points changed, or at least adjusted, every six months or so (if they're changed, check the ignition timing as well).
Step5
Check the ignition timing and adjust as needed (rare for a car with electronic ignition--post-1980--and some cars don't allow this at all).
Step6
Adjust the valves as needed (unless your car has hydraulic valves). Be sure to replace the valve-cover gasket as well, especially if you see oil on top of your engine.
Step7
Check the belts. Replace if worn.
Step8
Check the fluids under the hood and replenish as necessary. Change the oil and oil filter if it's been 3,000 miles since the last oil change.
Step9
Replace the air filter, which should be changed between major services--every 15,000 miles--as well.
Step10
Adjust the clutch, if you have a manual transmission (although some cars now sport self-adjusting clutches).
Step11
Service the battery, adding distilled water (if required), cleaning terminals and cable ends.
Step12
Replace the PCV (positive crankcase ventilation) valve. It can make your car run rough or stall if it gets clogged, and it's cheap and easy to replace.


EXTRAS---

If you want to increase your compression rate, i recommend Replacing the gaskets on your intake manifold and exhaust manifold.Also, Replace the oil pan's gasket as well. This will increase the compression of the engine block.


Please rate and god bless:)