1995 Mercedes Benz E320 • 6 cylinder 2WD Automatic • 148,000 miles

I have a 1995 e320 mercedes benz and when I start it its rough, yet after I drive it its np. But when I turn on the ac its rough when i'm idle not driving and if I stay idle sometimes or back up or start with ac on it cuts off. But when off it don't. Pls help me is it the serpentine belt or timing chain/belt.
July 4, 2011.

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