Q: Idling very rough after I bought the vehicle.

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Just bought today so I don't know much, but it barely idles at all. Sounds horrible, has a ring of dark soot around tail pipe, but only 120,000 miles on a v-8 and looks almost brand new with little things like all the fluids being fresh and full, so I figure it must not have been abused. What can I say, it was immaculate, and I bought it really cheap.

My car has 120000 miles.
My car has an automatic transmission.

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