Why does car cut off at a red light or stop sign while the air is on but if its not on it doesn't what could that be?

Cars & Vehicles

could be a combination of a non working idle compensator and a vacuum leak.

Poor vacuum will cause your car to stall at a light, the brake booster runs on vacuum, this together with the added load of the AC with the idle not being raised by the idle compensator might cause this to happen.

Check your vacuum lines, especially the one going to the brake booster, and check to see if when you turn on your AC the engine idle raises.

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If your car start up with no problems but once you put it in gear the car cuts off and says service engine soon and the oil light come on what does that mean?

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