For a kick in the pants, start with a good ol'-fashioned tuneup. New plugs (NGK or Autolite, never Bosch), wires, PCV valve (read how to remove it), air filter, and 2 cans of Chevron Techron Concentrate in the gas. Replace the front oxygen sensor with an OEM or a Denso direct-fit. Replace some of the transmission fluid (AT) or all of it (MT).
After all that is done, look into doing a "snorkel-ectomy" on the airbox.
The above will restore lost power. It's also good practice to bring the car up-to-date on maintenance before modding it.
Chemicals to order if you feel like going beyond the basic tuneup: Amsoil Power Foam to clean up the intake manifold, and Amsoil P.I. instead of the Techron. Auto-RX to gently clean up sludge/varnish in the engine. I've used the Auto-RX myself with excellent results, and have heard nothing but positive reviews of the Amsoil products.
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