Engine has fuel, spark, electricity and turns over but won't start, why?

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There are no OBD codes as I have fixed and gotten rid of all the codes that came up. I replaced the timing belt and accessories and timing is dead on, starter is good, alternator is good, battery is good, fuel system is good, replaced many sensors and cleared many codes. Cleared: P0017, P0102, P0122, P0302, P0304, P0314, P0335, P0341, P0351, P0365, P0366, and a few more I had on another list I can't find. The only one I haven't cleared is P0650. Help please because this is our only car and it has been down for 3 weeks now and my wife is chronically ill and I have to be able to take her to her doctor's appointments and for her tests and we have been having to reschedule so I can try to fix this car. Thanks!