Have you checked the engine rpm with the engine warm and the idle
stabilizer valve disconnected? To get a grip on this common problem,
that is where to start. Also check the rubber crankcase vent hose on top
of the engine. Often this will rot from exposure to oil fumes and will
get a tiny hole in it on the underside that is not obvious and that you
cannot see. Routine replacement of the hose (every two years) is a good
thing, and easy to do. Also suggest every two or three years on the fuel
injection hoses as well, which of course, have no connection with any
vacuum problem. Just fire prevention safety.

John Rodgers
88 GL Driver

Darren wrote:
>
>  My '87 is idling around 2000 rpm with the engine warm.  The idle adj
> screw is all the way in and I don't believe I have any vacuum or exhaust
> leaks.  A short list of parts already replaced include: ECU, AFM, ISV,
> O2 sensor, temp II sensor, injector seals, and air filter.  Also
> replaced all ignition components: plugs, wires, distributor cap and
> rotor.  Any ideas on what I might be missing?
>
> Thanks,
> Darren