The engine you are using is a rebranded mecoa, they are true abc and have an extremely long break in period, and will not run worth a crap until about a gallon of fuel is through them. Mine did not run right until near two gallons.

You likely need to replace the glow plug,these engines are hard on them for a while during break in.

If you have not gone through the break in process very well with this engine it is going to be a pain to keep running.
Here is a link to the manufacturer instruction list.

http://www.mecoa.com/mecoa/guide.htm

You may try reposting in the engine forum, a lot of the guys there are awesome with engine problems, and will know a lot about the mecoa. I found out there how to get mine running correctly, it ran, just not right. The nitro airstrike was my first glow plane also. I had a lot of problems with it, but it turned out ok.

Seems like a lifetime ago.

Good Luck