My LTFT's seem to drift apart in cells 1 and 2, which are very light throttle cruise. This is also when the EVAP purge is taking place. The driver's side is pulling out more fuel than the passenger side. In other driving situations (like cell 6) where I am at less manifold vacuum they are pretty much the same value. Since the EVAP line plugs into the driver's side of the intake, I am wondering if this is the reason for the increased difference between the two LTFT values. It only happens under very light throttle.