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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
In order for the engine to start and run you need good spark to the spark plugs, injector pulse , proper fuel pressure and good engine compression. If you can check each one of these things and post back with which one you are lacking I will try and help you determine the cause. Let me know and we can work from there.
Do not replace any thing till you check for spark, you can do this by removing one of the spark plugs from the spark plugs and holding it about 1/2 inch away from a good ground and have a helper crank it over. If you have spark you should see a nice blue spar jump to ground. A quick way to check to see if the cats are plugged would be to loosen the exhaust up at the manifolds till you have a healthy leak and see if it will start.