Thanks yes it makes sense that the maps are different. But at idle my rear cylinders injection pulse is around 2.100 to 2.500 and its O2 sensor stays close to the .865 to .930 range The front cylinders pulse will start around .020 higher then it will climb to 1.2 higher at the same time my O2 sensor drops from .8 volts to .025 or zero volts. This corresponds with a noticably rougher engine idle a cough, fart and then the idle smooths out and the two cylinders readings come close to matching then the cycle repeats. So I believe the volts from the sensor tell the ecu what to pulse but something in the chain of command so to speak is not synced and the injector and O2 sesor are chasing each other?? but what and why??