beyond taking them to a shop, I personally dont know. I'm not an EFI person, carburetors are what I deal with, being a classic motorcycles mechanic.
Also, go over your wiring, and see if maybe theres a short somewhere that could cause the ECU to think it NEEDS to provide more fuel.
obviously something has failed, or isnt right. if ALL else fails, rip the EFI junk out and slap a dual carb intake on that bad boy. PROBLEM SOLVED.
seriously though, I just remembered a POSSIBLE cause. check fuel pressure, and see what the manual says it should be at. when I was at a mechanic shop, we had a 240SX in that wouldnt run because the fuel pump was shoving WAY too much pressure downstream to the injectors and FORCING it past them.