car wont start

hey guys, i just took out the transmission on my 98 grand prix se with the 3800 series 2 engine. now that i have the tranny back in the car the car will not start. i checked all the wiring and connectors and they are all plugged back in. the car ran great before taking the transmission out of the car. do youhave any suggestions on what may be the problem. i checked the wires and i have a spark. i also checked the fuel regulator and i have fuel at the rail. the engine is turning over but wont fire.

thanks jeff

Only thing it could be if you have spark and fuel at the rail is a bad ground for the injectors, because every injector has it's own individual hot wire, but they are all on a common ground. Check where that runs to. The ground wire will be the same color on all 6 injectors.