tried to start 5.3 definetly no spark at plugs.

[Dustytrix]

Well I finally got to turn my engine over today but it will not start. I have 12v at the injectors and coils but cannot get spark at the plugs. It has 12v while cranking, I have checked all the grounds they are hooked up. Crank and cam sensors are plugged in. I checked fuel pressure and have only 40lbs but it has the new delphi pump intank. Could clogged injectors stop the spark? Any ideas?