checked for koer codes and heres what I got
 

A code 91-O2's out of range,fuel pressure out of specified range or injectors out of balance.Three months ago my mechanic tested fuel pressure and it was good and told me my 02's were bad so I replaced them.That leaves the third option.Does injectors out of range mean the injectors themselves aren't working correctly or is the injector harnesses bad?

I know I already answered this, but here goes: For your car, a KOER code 91 has only one definition: Your left O2 sensor is telling the ECM that your running lean. This can be caused by many things, but since you're not getting a code 41, that means it's either a problem with cylinders 5-8 or the O2 sensor itself.

Take care,
-Chris