Reddy kerosine space heater

Question

The heater has sat for approx. 2 years. when last used it worked fine. when i plug it in the spark plug fires and sometimes it will ignite for a few seconds an then shut down. the spark plug also quits fireing. if i stick a small propane torch by the nozzle it will run longer. is it poosible that the fuel is to old and causing this problem.