2005 Chevy Impala bump like something slips

2005 CHEVROLET IMPALA
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DUMMIE
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Drive Train Axles Bearings problem
2005 Chevy Impala 6 cyl Automatic 124919 miles

this car runs good somtimes ,the transmission changes out good when you start off . but when your're going down the road it will hold back or miss and sometime when you go up a little grade or a curve it will hold back or bump. had plugs and wires both changed.
Jan 28, 2009 at 12:59 PM
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RHALL77
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is your check engine light on? you may have a plugged fuel filter or maybe a bad cat converter.
Jan 28, 2009 at 5:47 PM