There indeed is this bug, that when you change gear setting while someone is connecting and you press escape, It will confirm a change, but it will be bugged.
Going from Auto to Shifter or Shifter to auto (1 of the 2) will make you have car which will not stall (because it's auto) won't shift until you shift (shifter) which will cut-off fuel when near max rpm. (auto wants to change gear).
It's actually pretty nice to try it some time, but it is a bug.