Ask the mechanic: Why does my Toyota Brevis lose power?

My car with CC 2940 and 200,000kms loses power when I hit a pothole, apply breaks or drive on a rough road. I have to disengage the gear lever again from drive to parking and back to drive but even then, it moves at a slow pace until after about 20 feet. What could be the problem and how can it be fixed? Patrice


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