Turboman

The issue started after i install my dsm 390cc injectors to test it out to see if it works w/ my stock ecu and to find out why my air/fuel ratio reading is so lean. Since then I have install my stock injectors back in, but it's still the same. I've tried resetting my ecu, change both my O2 sensors and check my ground wire @ my thermostat, but that didn't fix it......

Any suggestion and idea?