I'd be willing to bet you have an ignition coil breaking down. I had an '05 in the shop a few months back that the customer insisted was a transmission fault. I felt a hitch in the car on acceleration, came back to the shop and pulled the engine cover off. With the engine running, and all loads (A/C, lights, etc.) and the vehicle in drive, #4 ignition coil sent a nice fat blue arc to the valve cover along with a 'pop', which the car lurched in time to. Swapped the coil, and test drove vehicle, no more lurch, and customer says it's running better than ever.
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