[AnotherWs6]

Agreed that a 2 O2 sensor system would be much better. I have to assume this was not done due to cost and complexity. This is not a multiport system so think about it..... If it is reading that one side is spot on while the other side is lean and it is averaging the two readings it is going to sense a mild lean condition. Then it is going to compensate by adding more fuel. Then it is going to see that lean bank get corrected while the bank that was running good already goes rich, which is going to want to make it pull fuel and then you're back where you started.

snj8198 - An open spacer may help mitigate problems. Also, grinding down the divider or both. You're messing with how your manifold was originally designed to work, but it may be worth it. Aside from stumbling, etc issues, I like the fact that the system was able to compensate when steveo lost an injector. Depending which bank it was on he could have easily lost a motor if his intake was completely divided.