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Bosch super 4 plugs are terrible in my experience. Swap them to normal plugs and gap them to OEM. Try a different AFM too. The speed sensor doesn't force it into closed loop. It just has some speed fuel compensation that leans out the higher rpm. Shouldn't be a problem for most people. Only becomes a big problem with turbos. I first discovered the behaviour on a dyno.
Bosch super 4 plugs are terrible in my experience. Swap them to normal plugs and gap them to OEM. Try a different AFM too.
The speed sensor doesn't force it into closed loop. It just has some speed fuel compensation that leans out the higher rpm. Shouldn't be a problem for most people. Only becomes a big problem with turbos. I first discovered the behaviour on a dyno.