My 08 2.4l sonata gls won't start. I started it this morning to warm it up while I cleared off all the snow, it was running for about ten minutes. I turned it off and about twenty minute later went to start it and it will not catch. All the electronics are running and the engine turns over but it won't start. I replaced the battery in December, the oil was changed last week as well as the air filter. It has 93k miles on it. What could be the problem?