Toyota 4runner 2.4L 30 to 80km losing power - 1988 Toyota 4Runner

When and where are you loosing power?
is it intermittent?
can you be more specific?
could be as simple as a bad fuel pressure regulator or clogged cat

I would check on a tune up. Have you changed the spark plugs, wires, and the cap in a while? If not, that would help the power. Are you getting bad gas mileage now? If so, spark plugs. If not, check your vaccum hoses for a leak.

Check the transmission fluid and make sure that it is within the operating limits indicated by the dipstick. Dont forget to check it while the engine is running otherwise the reading will be wrong.

When was the last time you did a tuneup? plugs, wires, cap and rotor.