Shonn it is best to start with the fuel, air, fire basics. You need to determine which one of the three has left your engine. Hot blue-white spark at the plugs? Fuel delivery/ pressure to the nozzles? And intergity of the compression, timing and manifolding i.e. no massive vacuum leaks disrupting the cise sensor plate. There are many many specific things it could be but it will be a disruption in either the fuel/air/fire sequence. You need to determine which is missing and then pursue the diagnosis in that direction.

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Paul