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Do a compression test on the engine to see if you have equal compression across all cylinders. Low compression will cause a no start condition. Also check to see if the fuel is getting to the engine. Low fuel pressure can also cause a no start condition. If the pressure is low check the fuel pump or replace the fuel filter as you may have a blockage. Try spraying starting fluid into the throttle body while someone cranks the car. If it starts the problem is in the fuel system. If not your ignition system is the issue.