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Hi,
I bought my used 2007 Cobalt Lt (97K miles) 6 months back. Drove it for 7k miles. Recently i noticed the car Jerks when the Automatic Transmission shifts in RPM Tachometer (1st & 2nd gear). Also, the car makes a Thud (Shake) when i shift gear from P to D.

I thought it was a Cylinder Misfire caused due to bad O2 sensor and changed it
now i guess its a Transmission related issue.

PS:
I moved to USA a year ago from India for my Masters Degree.,so I have very less idea about cars.
 

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Common problem with these ageing cars, reseat the 2 blue/gray plugs on BCM to see if it helps. Sometimes corrosion builds up in contacts causing your transmission to lose GMLan or communication with all other CPU's.

 

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Trans fluid and filter change can 'cure' a lot of issues, especially at the mileage of your car.

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