[jdl]

That screw on the throttle linkage, is for adjusting the minimum idle air and usually sealed. I wouldn't fool with that unless your having a problem.

There might be an emissions sticker under the hood that may list the specs.

This is just some generic specs. v6--750-850, 4--750-1000. I didn't see an engine size listed.

Sometimes, just cleaning the throttle-body and idle air passages will help.