idling engine keeps cutting off.

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I have a 1991 chevy G-20 van that I recently bought. When I drive it for approximately 120 miles with the air conditioner on, when I come to a stop sign or red light, the motor tends to cut off. I think this van was setting up for about 2 years prior to buying it. I have changed the fuel filter, the oil and oil filter, changed the transmission filter and fluid, and tuned the engine (plugs, D cap, rotor, wire and coil) yet, the problem persists. Do anyone know what is causing this problem and how to fix it. It also appears that the motor is overheating.

posted by  lenzy8260

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