Crank but will not start

Well what I would do first is get new spark plug wires (preferably AC Delco). Then I would check the fuel filter to make sure you are getting the correct amount of fuel going into the motor. I would then check to make sure you dont have any vacuum leaks. What you do is take carb cleaner, then spray around the top of the intake and around the base of the throttle body. If it revs high when you do that, you have a vacuum leak. If that is the case, I would check all your sensors. It could be a bad coolant sensor or an 02 sensor. What I would also do is do a pressure test. Worst case sinario it would be a head gasket leak or an intake leak or maybe even a cracked head or engine block. Let me know how it goes!