PLEASE HELP

1993 GMC sierra k1500 4x4 5.7 throttle body injection My truck was parked and running then just stopped. I can hear the fuel pump running when I turn the key on.just replaced it last year. I put a few squirts of fuel directly in the throttle body ,where the injectors are,it didn't even attempt to start.

I do think it getting fire. I removed the coil wire from the distributor cap,inserted a screw driver and then rested the screw driver very close to the center prong (coil prong) on the cap. I did not see any spark at all. I also rested the screw driver on the prong and still no spark.

I reconnected the coil wire and then removed the other end going to the coil. the prong or connection point was all covered with a white powdery substance. I cleaned it off with emery cloth ,but still no spark.

I'm guessing its my coil, could it be anything else? Thanks for the help AD