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2007 Pontiac Grand Prix Question: my odometer isn't reading my speed and myy Transmison isn't shifting rite?

 

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Rydr07PriX, 3.8L V6, Biola, CA, August 17, 2014, 20:19
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note before that I was getting a OBD2 ccode large leak detected. changed gas cap. cchanged purge silonoid. and there was a gas odor evertime I put gas. come to find out my catylac converter was so pluged it turned into dust when I knocked it out. so then thts when my Odometer sttoped working and mmy tranny started to not shift.

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