I’m putting those two Ballenger AFRV2s with the production grade NTK sensors in the GTO. When I replaced the fuel pump setup a while back I noticed while cruising the STFTs on the right bank were +25% while the other side was close to zero. (and this was a new behavior) I had a wideband in only the other side, so I couldn’t tell if it was a sensor problem or not. Since I replaced both narrowband sensor and it didn’t make a difference, I suspect there might be a problem with one of those old Deka 60lb injectors. Once I get the two widebands installed I’ll confirm the fueling is as I suspect, and disable each injector in sequence and see if one of them is the problem. It is really just a curiosity, as I have brand new ID1050Xs to put in, plus a real nice fuel filter.