Q: 03 Chevy impala idle is rumbling until 30 mph reached sounds awesome. After stopped rumbles again along with white smoke car not o

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I have a 03 Chevy impala. Car been sitting up for a year. We have a rough idle up until 30 mph. After that she runs smooth. Upon stopping idle is rumbling. Changed coil pack and also change spark plugs . Also exaust emits white smoke

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

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