1992 Chevy Blazer Injector Plug

I have a 1992 Chevy Blazer 4.3L, 2 wheel drive with approximately 191,000 miles. I have had to have the truck towed twice for problems with the injector plug unplugging from the injector. The injector plug is not the correct one that came with the truck. I need to find out where exactly the injector plug would be located on the truck so that I can plug it back in myself instead of spending alot of money getting the truck towed to a shop each time it comes loose, until I can find and have the correct injector plug shipped to me. I have very limited knowledge of engines so please be as specific as possible.Your help is greatly appreciated.

Thanks Alot