Your last post had no fuel... I am going to figure something fixed that problem... ? you didn't post back .
All you need is fuel spark and air... At the proper time and in the proper amount and you will have a running engine. So assuming the spark is adequate and the fuel is also, that only leaves proper air flow....
What brought this problem on? Did it suddenly quit and not start again, or has it been progressively getting harder to start? KennyV