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You may get a divergent opinion from others, but many things I don't change until they're needed. E.g. I'm not going to do an oil pan gasket unless the oil pan is leaking. If it is leaking, I'll do it even if it hasn't reached its "service interval". I'll usually let the accessory belts go until they squeak.
I'd agree with doing:
-Timing belt (and any related tensioners)
-Plugs
-Plug wires, though you may be able to check resistance and clean the ends and get the same result
-Distributor cap and rotor
-Fuel filter
-You should be changing your oil regularly anyway - 7-10k miles is reasonable with a good synthetic
-Check your engine air filter, and cabin air filter for that matter
-Change your EGR valve, they're cheap (can't remember if the VX doesn't have one?)
-It's possible your catalytic converter could be getting clogged. These can be cleaned, see my Insight build thread on what I did.
-A drifting O2 sensor might also cause power loss, but will often throw a CEL
Have you checked your distributor timing? Other potential problem areas include fuel pump and injectors.
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