1995 GMC Jimmy Engine Stall at idle

When sitting and idling about 5-10 min, with the air conditioning on, the engine will stall (as if the key was turned off, no hesitation or sputtering). Engine will not restart unless I spray some starter fluid in the air tube. Once the engine starts again, it will shut down again in 5-10 min. At idle only. Engine will idle fine with A/C off. Car will drive fine with the A/C on or off. I just replaced the fuel pump, fuel tank sending unit, fuel filter and fuel pump relay. I don't know if this problem was occuring prior to fuel pump replacement as I have not used the A/C since last year. I disconnect the compressor in the winter to save gas (as you know thecompressor runs when windowshield defogger is on). Any ideas? Thanks, John