there is a vacuum hose connected to your key and it cuts the car off..
if the vac system is not working when you turn the key off it keeps running.

if the key only works when you open you door then the vacuum line going to the door lock is being pushed back into position and making the vac system work while the door is open....then coming out while the door is closed... this is also affecting the transmission shift...

so fix the vac line in the door or cut it and plug it...