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Q: 4.3 v6 fuel injected n have gas to the injectors,also spark but no start on 1991 GMC S15 Jimmy

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i have replaced rotor,cap,wires and sparkplugs.also have new fuel injectors,map sensor throttle position sensor also the hole timing rotor.so lost please help i dont know wat to do next?i also took a test light to all the power and grounds for the fuel injectors and ignition module and every thing works fine and plenty of coil power??
If you spray carb. cleaner into intake hose through air filter box top does it try to start and run? If so fuel problem! If not spark problem!
May also be plugged exhaust. One of these three things i bet is the trouble.
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