I ran my Daytona today for the first time since installing a wideband. Car runs stoich for 10-15 minutes at idle then it goes lean, reading 16:1. I tried unplugging the CTS and it drops the afr to ~13:1, so I am confident the gauge & wideband o2 are working. Computer stored code 51. Fuel pressure is set @ 35 psi, with +20 injectors, stock 2.5 MT SBEC. FP did not drop when the wideband went lean. Idle gets lumpy and erratic when it goes lean. Tach not working, so I'm not sure of the change in idle rpm. Narrowband o2 is new. Anyone have any thoughts?