Running lean??

[Raksj04]

I have a 87 base with a S4 JDM swap with a 2.1 rtek running 550/720 injectors, my wideband is a PLX with a multi gauge. It is After I wired in my narrow band output from my wideband contorler to the ECU I noticed the car would cruse with a really lean unstable afr. It would jump from 14.8 to 16 during a low load drive steady speed level driving. The would also feel like it would stumble a little. If I would accel more the AFRs stablize at about 13.4 under vaccumm. Under boost they would get close to 15.5 and would not get richer. Disconnecting the wire I wired into the ECU did NOT fix the issue. The rtek will log the narrow band signal. also the car will idle at about 10 to 11 AFR. Any help would be great, or a place to start. If you have any questions reading this ask or pm me for my phone number.

[Raksj04]

I have a 87 base with a S4 JDM swap with a 2.1 rtek running 550/720 injectors, my wideband is a PLX with a multi gauge. It is After I wired in my narrow band output from my wideband contorler to the ECU I noticed the car would cruse with a really lean unstable afr. It would jump from 14.8 to 16 during a low load drive steady speed level driving. The would also feel like it would stumble a little. If I would accel more the AFRs stablize at about 13.4 under vaccumm. Under boost they would get close to 15.5 and would not get richer. Disconnecting the wire I wired into the ECU did NOT fix the issue. The rtek will log the narrow band signal. also the car will idle at about 10 to 11 AFR. Any help would be great, or a place to start. If you have any questions reading this ask or pm me for my phone number.