You have four bolts right they're coming off where the manifold meets the two catalytic converters... What typically happens is the fitting where's a little bit in the bolts corrode and lock and feel real tight but you're getting an exhaust leak that sucks in fresh air... By the Venturi principle... That confuses the oxygen sensors and they give the computer weird readings
I know you were looking into the wiring and all that a while back... And it's good to make sure one of the oxygen sensor wires is not touching the exhaust or anything... But I doubt it's anything sinister in the wiring, could be , but most likely it will end up being something tricking the computer , or a couple of things working together like an exhaust leak and a vacuum leak.