97 trooper dsl. The ac works for a minute then ac lights on &off eng. up& dwn

As in answer 1 check your coolant level as well as the rest of the cooling system.Make sure your radiator cooling fan and condenser fan are working properly.Have somebody check ac pressures!!!An overcharged system or bad cooling fan will trigger the high pressure cut off switch and put a higher load on the engine possibly creating an erratic idle.Check and clean throttle body as well as idle air control valve.First step: Check ac pressures as i said before>Good luck and let us know what solved the problem.

First - Remove radiator cap and make SURE coolant level is *FULL* while engine is COLD! .. Low coolant level can cause 'rolling idle' and A/C malfunction... Possible a/c relay failure > under hood fuse/relay box.