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what is the most common problem with a p0621 code?

   
Old Sep 9, 2017 | 5:02 PM
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jim355
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Default what is the most common problem with a p0621 code?
I have a 09 chevy impala ls 3.5 an I ge a p0621 code and my speedometer is erradic , engine stalls sometimes, rough idle, trouble accelerating from a stop, bad fuel mileage and shifts at different intervals
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