The interview has probably passed, but I just want to say don’t ever skip an interview. I’m currently on an academic job search that has strenuous, 1-2 hour interviews. I have a severe stutter. I stress, stutter, sweat, etc. but it doesn’t last forever! At least it’s only about an hour of your life. Please don’t rob yourself of an opportunity over fear of stuttering! In the future, if you let them know about your stutter ahead of time, they may be able to accommodate you with more time.