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Miscellaneous on 2004 Buick Rainier

While driving with the air conditioner on, the vehicle feels like it wants to turn off & when I stop at the light it does. It runs fine without the air conditioner on. What is causing this? It just started happening.

Asked by for the 2004 Buick Rainier
Sounds like your A/C system is putting too much load on your engine or that your engine is not compensating the idle speed for the extra load the A/C Compressor is putting on the engine. I would start with the Engine Performance Diagnostics. best way is to check the codes in the computer to see if you have a sensor/system that is going out, like the Idle Control Motor or Electronic Throttle Body System.