[mpumas]

It could be one of two things==spark or fuel. So which one. The rule of troubleshooting is to test to see which one is creating the problem before trying to do any replacing. And you need to do the testing when it won't start. I suggest you check for spark first. If you have spark, check for fuel at the distribution rail. I'll bet that the problem will be spark and probably the ignition coil/igniter but I could be wrong. After you do the testing come back to us and we will try to help you.