Accel 7 tuning

[1bad68cat]

"Can the timing required for each bank be different?" Not thru a distributor. You can set the fuel injector timing. (should be around 310) this is based on the cam profile. That will affect all injector firing not just a side.

Minor timing won't create that wide of an A/F split. Typically its either Air or Fuel, but I have seen distributor phasing be out which caused stumbling at around 2500rpm, but ran fine otherwise. It did cause irratic A/F readings. We drilled a hole in the cap at #1 to find the rotor was sparking 1/4" before it got to the plug. That was cool looking, but...
I've also found a complete bank lean due to a bad ECU.

I was looking at riching up the lean drivers side to see if that equated to all cylinders on the passenger side going equally richer. If only one cylinder goes rich, that will cause the A/F on that side to show richer. It will also make the car drive nicer and get rid of your lean stumble while you search for the problem. Well, that's assuming your stumbling is being caused by a lean condition and not something else. If one cylinder is causing it, you will pick it up reading the plugs.

How do you change injector firing? I've tried looking for it in the past but could not find it.

As for the lean condition, it is the entire bank the way the plugs read. Is there a way to richen just the one side without affecting the other side?