97 gmc sierra 5.7 no spark

Going down interstate running fine,Then just died,Changed timing chain & gears,camshaft ,crank,throttle pos. sensors,New cap & rotor,new gear on bottom of distributer, new coil and module,everything but the knock sensor and computer,Still no fire, Plug wires are good,:banghead:

have you check for voltage into the coil for starters?