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Yes, radio shack is generally very good about exchanging the cars for you.
Its very unusual to find a car without the twitchy steering (usually called steering chatter). When you run the motor the front wheels will hunt back and forth. This happens even when the motor is not installed. I suspect that the problem is with the software more than the electronics or components, so there isn't much that can be done about it.
However, the steering should be fairly even to both sides and all the wheels should be on the ground (make sure the rear axle is fully inserted if this is a problem).
Radio shack often has an SE or two on the shelf as demo units, you might be able to take yours in to compair to those to see if its acting strange.
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