I am sure this is posted somewhere, but could not find.

Engine will continue running with ignition key off. Have to use emergency stop on engine to stop.

What needs to be replaced and where is it?

Any thoughts appreciated - Ron

YOU HAVE A VACUUM LEAK. BEGIN BY LOOKING AT THE HOSES BY THE OIL FILTER . TAKE THE HOSE LOOSE OFF OF THE IP & SUCK ON IT WITH THE ENGINE ON IF IT SHUTS DOWN THE THE SHUT OFF ON THE IP WORKS & YOU NEED TO LOOK FARTHER. USE THE SEARCH FEATURE TO FIND MORE POSTS WITH MORE IDEAS
HTH
JOHN M