In and internal combustion engine, you need 2 things to make it run -
1) Spark - electricity - the next time tumirik ka, take off one of the spark plug wires and place it NEAR a body ground - then have someone crank the engine - no spark or weak spark and you won't run at all.
2) Fuel - no gas going in, no run no start. Bring along a small bottle of lacquer thinner, next time tumirik ka, take off the air filter and pour a small capfull of thinner down the inlet manifold throat - if it runs then you have a fuel problem.
These small tests will give you clues as how to proceed.