If you cannot get it to tune/run properly, take out the fuel tank, remove the stopper and check for debris. Also check for corrosion of the metal fuel tubes in the tank. Flush out the fuel system (including carb) and have another go at it. I usually take the carb apart and ensure that all debris is cleaned out - I flush with alcohol and blow out the system with low pressure air from my compressor. I am assuming that your glow plug is good. I used to have this problem a lot - I could not believe how quickly the fuel system can get gummed up. Of course this has a lot to do with fuel quality and storage conditions, but in my case, a few months would do it. Now when I am done flying a particular bird for a while, I fill/flush the fuel system with clean alcohol and then dry it out with compressed air. Hope this helps.

Steve