Hey all currently working on a single turbo 14 v6 with a new dw400 in the tank and new ID1050x injectors and am having complete hell getting this tuned. current tuner saw issues with the o2s and decided to try and tune off of ONE singe o2 sensor (passenger side) and disabled the divers side so it no longer even shows. car backfires like someone playing with a full auto ak on decel but the real issue is when trying to get a log the car would not go over 4k at all. said it sounded like spark blow out so I changed the plugs and the old ones were completely fouled (carbon) and now the new ones just from troubleshooting are fouling. any suggestions on what to do next? all plugs are gapped at .028, have checked fuel pressure and held at 60psi from the pump to the rails, no misfire codes only code has been a p061b ( torque calculations code), have new o2s, new maf, tested coilpacks all are good, grounds appear good to the chassis. I have also had people say you can not run off of one o2 they both need to be on and activated. idk at this point any help is appreciated
(edit): car also falls to the floor in rpm and stalls when ever gas is touched or pulled out of gear. idle is fine but that's about all