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All of a sudden my automatic 2010 started to fluctuate in drive. It doesnt do this really in neutral or lower gears. It really gets bad around 2grand rpm. I know my cats are in need of replacement but this just happens at random! No engine codes. Any thoughts?
 

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Check your transmission cooling lines to make sure you're not losing fluid. Sounds like torque converter is losing pressure and unlocking prematurely.
 
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