Ignition switch when you turn engine keeps running have to open hood and push stop button what is wrong ? how do I fix it ?

 

check your vacume line from the air pump to the back of the ignition key ,on the back of the ignition cylinder there is a vacume switch ,you must have vacume at that switch when you turn off the motor,
also on the top of the injection pump in the back of it there is a vacume diafrugm when you trurn off you must have vacume to that line ,to see if that unit work turn your key off put a vacum hose there and with your mouth suck on that vacume line it sholud turn the car off if not replace that unit,