[CjLink]

cant help you on that one... only thing i can guess is that you might be experiencing some torque steer and as you're correcting it you feel a wobble... but if it's still there when you're not accelerating then thats out of the question

other than that it could only be wheels or axels... balancing, bent rim, warped axel, bad bearing... definetally drive train though

 

[CjLink]

did they try tightening all your lug nuts? honestly sounds like your wheel is about to fall off... might just be a really bent rim... well if it's as bad as you say they have to do something about it