can any one tell me how to properly adjust the small needle valve on the throttle body of 1988 4.0 auto 4x4 its above the large vacuum line that goes to the brake booster i took it out and cleaned it and now jeep seems to lost power and has lots of hesitation. thks

I couldn't find anything in my Haynes manual but make sure you didn't break/disconnect any vacuum lines. They're hard plastic and break quite easily.

Is it the litle rubber thing under the module closest to the DS fender?

it is on the driver side has torx screw if you look its just above where the large vacuum line goes to the intake for your brake booster .

I know where that is now, not sure how it effects the engines performance. I would try to adjust it all the way in, then back it out 3 turns, basically get the jeep started, and try and adjust it till you get your performance back.