Sounds like you have a couple of contradicting things going on . Not drawing fuel and runing to rich after it starts. It should run find at 1 1/2 turns out on the needle valve and be on the rich side. Here's a couple of things you could try once it is running. Pinch the fuel line off so no fuel is drawn to the engine once it is running. If it speeds up before it stops its probably getting to much fuel . Then i would take a close look at the needle valve. Maybe some crap in it. If it stops abruptly then I would look at the glow plug . Even if it's new could be bad or have some contamination. Good luck .