[Elwood]

Thanks Bill. That's worth a try. I'll see if the connectors let me cross to opposite injectors or if I need to build jumpers. I was also thinking I might pull the plug wires off of #4 & #8 and hook them to grounded old spark plugs to see if they lose spark out in the air at the right temp and rpm, just for another data point.
This one realy has me baffled so far.