You have a vacuum leak. The engine is stopped by the application of vacuum to a diaphragm at the rear of the injection pump. Check your vacuum lines to the pump and make sure they're properly in place. From there work away from the pump, checking lines as you go.

I don't know about your particular model, but removing the oil filter at oil change time will result in vac lines knocked loose on the cars I've tinkered with.

Good luck,