Will crank, won,t start?

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I have a 1994 Ford Ranger-I blew up the muffler-put in new Catalytic converter and Heartthrob exhaust; I have fuel pressure at filter and fuel rail: I have fire at ignition packs; the truck will crank, but not start; it tries to fire but tries to backfire also; code reader pulls nothing but a 111 and a 10;PLEASE HELP