1990 Oldsmobile 98 1990 Olds 98 Regency. No power to any f

Electrical problem
1990 Oldsmobile 98 6 cyl Front Wheel Drive Automatic

Lost all power to all fuel injectors. Is there a relay somewhere or a fuse?
Had one connector that when we pulled it off while motor was running made no difference in engine RPM, so pulled off connector on next injector and switched them. 1st injector now works and 2nd one doesn't. When put test light on 1st injector's plug- had a light. Accidentally touched a ground somewhere there was a spark and now I have no power to any of the injectors. Where do I start to look for the problem? I understand that there is a fuel injector relay, if so, where is it located? Or is there a fuse somewhere, can't find that either! Or is the problem now in the computer?
What is the metal electrical box with all the wires going to it underneath the coil pack called? ECM? Or something else?
The car developed a miss and after checking all the plugs found they were all firing. Felt like an injector was not firing-that's why I was switching and looking for a problem with the injectors.