Also, is it possible your TPS (Throttle Position Sensor) is off just a little? I had idle problems like crazy and so I replaced most of the vaccum lines, cleaned out the plenum, put new gasket on, cleaned out Throttle Body, put new gasket on.

Then I adjusted my TPS and now the idle is closer to normal than it ever has in its 1.5 Years in my hands.

'90 Trooper - 2.6L 5-Speed - 1" BL - Custom Roof Rack+2x55watt ProComp - Herculined Interior - Pace Setter Header - Dynomax Super Turbo - K&N - ProComp ES3000 Shocks - Optima Red - MSD 6A - 31" Kumho Mudders - Black Rock Crawlers