How bad is this vibrating? Does it almost feel as if the whole car is shaking? If so, then you probably have a dead cylinder, most likely due bad spark plug wire.

Running an open BOV won't make your car stumble like the way you mention it (just stall the motor at most), but running an open BOV can eventually help lead to the problem you are describing. Check your plug wires, check your spark plugs again and keep your BOV recirculated. Should probably fix your problem.