[PhillipsLT5]

Originally Posted by Kevin

right there with you buddy. new plugs, wires, coils, pumps, filter, vac spider, ac...and that's just what I remember off the top of my head and I've had 2 weeks of perfect running in the last 4 years. It's a great car but the vac system has to go. It's rubbish

That said:
I would be willing to wager that your vacuum leak is coming from the rectangular rubber block on the plenum that connects the EVAP and PCV system. The block breaks down and gets loose and causes a high idle.

Mike100, on the 90, the EVAP purge is attached differently than the 91-95 cars.

PCV hose original or ? if so its toast