It seems its the condition levers. If I do a cold and dark from the 172 but leave the condition levers on run instead of pulling them back to ground stop everything works.

If I try to say pull condition lever 1 back to the ground stop position as I'm pulling it back at a certain point in between It must glitch because when it hit's\passes through that point the engine will start and if I hold it their it will continue to start and then run.

I will post a video.