Before you seal your motor, I would first set the needles back to stock settings. I would then make sure I had a fresh glow plug. I would set the throttle trim knob up higher so the slide is more open, make sure the truck is up agianst your leg or an unmovable object as it will rev up high, until you turn the throttle trim knob down. Put the ignitor on the glow plug, and try to get it fire. if it fires and runs LEAVE the ignitor on the plug if possible drive it like this a few laps. Try removing the ignitor, if it stalls out imediately. Pull the plug to do a visual examination. Is it real wet and shiny? That would indicate a very rich fuel mixture. Try leaning the high speed needle somewhat, in 1/8 turn increments. If the plug still glows bright try reusing it.

On the other side of the spectrum it could be running real lean which would also cause imediate stall out. Inspect your glow plug. Is the coil burnt brown, or distorted looking? If so try richening up the high speed needle first in 1/8 turns. Still stalling out? Try richening the low speed fuel mixture screw a little bit.

Make sure your using the right heat range of glow plug. I hope this will help. Sometimes it takes some frustration, and fooling around to get things set right. If all else fails then I would check the engine for air leaks.