Question about a car problem?

I took an automatic Honda accord station wagon for a test drive. While accelerating the car didn't feel smooth, especially when it it seemed like the gear was changing, it almost seemed bumpy/ sluggish when speeding up and going into different gears.

Any idea what that problem might be? It's an automatic imported car. The car dealer said it seemed normal when he drives, but I won't be trusting him lol.
Question about a car problem?
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