I have a 2006 Chevrolet Colorado LT with the 3.5L inline 5 with an automatic transmission.

It cranks but won't start but it does start with Starting fluid and runs for a couple of seconds before it stalls. We have replaced the fuel pump and a fuel injector harness because the previous owner had that harness basically shot.

Really need to fix it because it's a friend's truck.

It has these codes Injector 1 control circuit failure Injector 2 control circuit failure Injector 3 control circuit failure Injector 4 control circuit failure Injector 5 control circuit failure and also Crankshaft Position Variation not learned. 

Even though I replaced the fuel injector harness it still marks that the control circuit is messed up what else can cause this problem?