There has never been a time I could not get any of my many nitro engines to start unless something like the glow plug igniter not being charged. There has been a few times it took a little more but never where I could not get them to start. I use after run oil in all my engines for over 6 years even in my back up engines that I am storing. I have had vehicles sitting for over a year and not have a problem. If it was running and you set it up then it should run now unless you did not store it properly. If you have compression, is getting fuel and the glow plug is good as well as the igniter then it should start. Did you take the plug out and put it in the igniter and check it? I would try a new plug any how.
I do whish you good luck.