Interesting. So the idle gets higher with age, or opposite?
Did these models do this new, or is there something you can replace/repair?
I have a 1995 ls and it idles at around 1700 for a few minutes, then goes back to the normal 500'ish. It's not too big of a deal, just really annoying. It jerks into gear and fights hard when coming to a stop. When downshifting, the car feels harsh and out of control while idling high.