Electric window motor

Hello everyone,
My sons car which is an 87 Diplomat has power windows and the drivers side window will not go up unless you actually grab the window pull up on it at the same time you push the button. Now when you go to put it down you just barely touch the switch and the window will drop all the way down. And if you shut the door to hard with the window up the window will drop down all by itself. Any ideas from anyone on how to go about fixing this problem????????????????? We've checked auto parts stores for a motor and you can still get that but my son says there a regulator inthere and nobody can get that part. If either of these is the problem does anyone happen to have extra parts????????????

Thanks Ken
Author: dipin87