Cranks but will not start is it the fuel pump relay

If swapping the relay helped it is very likely a bad fuel pump. Do you hear the pump turn on when you first turn the key on? It will prime for two seconds. If not a quick check is to reach under the car and give the fuel tank a hard whack. Many times that will jar the pump enough that it will start working again. Still a bad pump but now you know it is a bad pump.
The tank has to come out to replace that one.

Fuel pressure gauge on fuel rail 52 at prime 60 at attempted start. NOW check this out hooked up a snap on computer forced the injectors to pulse which they did (when told) and the car started right up... SO the injectors are now being told to pulse when starting

OK, no injector pulse is usually a bad crank or cam sensor GM uses input from both. You should be able to use that SO tool to see all 3 and tell which is sending the bad signal.
The 3.4 has 2 crank sensors and one cam. The cam sensor is mounted where the distributor used to be. The cranks sensors are split. One is up front by the crank pulley the other is mid block and reads the crank ring. They are Crank A and Crank B on most scan tools.