1999 Chevy Suburban in Ventura

1999 Chevy Suburban 5.7l in Ventura -- This one had a crank but no start condition. Had good fuel pressure at 50psi, but had no spark at the plugs and at the ignition coil. Used the oscilloscope to check the crank sensor(after checking power and ground there also), found a nice square wave presenting, load tested the signal wire back to the engine computer, good.. found good power and ground at the ignition module, and a good square wave coming from the engine computer as well. What I didnt find was a signal coming out of the module going to the coil and tachometer. Installed a new module and it fired right up!