92 calvalier 3.1 MFI

Can anyone assist my chev turns over but wont start.Batt is good .Ive got voltage to the ecm.I did the code thing and only get the 4 12,s.nothing after.i checked the fusable links located at the starter.there ok.i checked the fuses there ok.there is gas and i can hear the fuel pump turn when its supposed too.If you can assist please email me at [email protected] I HAVE SEVERAL ECMS FOR THE PONTIAC AND CHEVS I will sell for 25 and you pay shipping