After driving at highway speeds for over 1/2 hour, my 1993 Acura Legend Coupe starts shaking and making a bumping noise like there's a flat or unbalanced wheel when you try to accelerate, and you can no longer accelerate. It becomes undrivable, you have to then pull over, wait a half hour and start again, only to have it happen again in 1/2 hour. It's wierd, only happens when in gear (auto) and accelerating. If you take your foot off the gas it's fine, if you drop it into neutral, it's fine & the engine revs fine. The tranny shifts fine, up until this happens. So I think this rules out wheels/suspension/brakes/engine, and gets to drivetrain.

No mechanic has yet felt the problem cause you need 50 miles of open road to get it to happen.

What do you think it is?? My bet is torque converter. Has anyone ever heard of this??