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I have a 2001 Pontiac Aztek that shifts hard thru the gears It only does it if I stay sitting in one spot with the motor running for more then 3 or 4 min then when I take off it starts to shift hard it will stop once I turn the car off for a min or two then will drive fine until I stay sitting and running again then it's starts again any ideas would be appreciated! Thanks


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Location: Oregon
your check engine light is not on is it?


   
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Yes but the only code that is putting out is for one of my O2 sensors


   
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when the check engine light comes on the computer knows there is a code stored and won't run normally. See if fixing the things that the check engine light is on for and clearing the codes in memory doesn't take care of your hard shifting problem.


   
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Well changed the o2 sensor lite went away still shifts hard when it sit while running for more then a 3 4 min?


   
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Location: Oregon
you may want to see is the TSB# 00-07-30-002b dated july 2002 may be a concern for your trans. It talks about the pressure control solenoid assembly. but it also says it's related to codes p1811 and/or p0758. harsh upshifts, garage shifts, launch, slips, flares, erratic shifts...


   
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