Turns out the problem was simply that the car was set on the rich side. I had my shop do some tinkering and set it properly. The surging is now gone. I think what I was feeling in the surge was the lambda box pinging off the rich stop. Every time it would richen the mixture for a quick second I would feel that as an extra pull. The duty cycle is now right where it should be.

Thanks to everyone who helped with my problem.

- Andrew

Paul, aadrew10 has Dwell scales for 8cyl and the 6cyl cars, note on the face of the meter says
for 4cyl cars to double the 8cyl readings. I know this post is old but, i am interested in this subject, why not use the 6cyl scale since our cars are 6cyl.

Because in this test, you are attempting to read the duty cycle of a single pulsed injector (FV), which tells you what the lambda system is doing to correct the mixture to stoich, not set the points gap for a 6 cylinder distributor...

Paul, I see what you mean, thank you.