Hello to everybody. I'm a newbie. I have a 94 Galant Super Saloon with auto transmission. When I shifted to drive/reverse mode, the revs dropped to 600-700 rpm causing engine vibration and eventual shutdown. The local mechanic replaced the servo drive assembly and cleaned the throttle assembly but still the problem exists. In idle mode the revs seem to be normal. I have to give a little gas to avoid engine shutdown.