[Maffett]

Ingo,

I've got a pressure gage installed on the fuel supply line between the filter and the fuel distributor. It reads 60 psi steady. Seems like this should be closer to 75 psi. I relocated the fuel pump from the rear to the front several years back. This probably reduced my system pressure a bit, but until now it hasn't been a issue.

I've got another pressure gage in the control line between the WUR and the FD. It ramps up from 25 psi to max out at 44 psi at 180 F. At this point I can valve off the WUR with no affect to engine speed or change in idle. Once again these pressures seem low. Maybe I should be focused more on getting these pressures up to spec.

I set the A/F mixture using the LM-1 and adjusting the FD set screw and bypass screw. The car runs much smoother now, but the bucking still hits in part throttle.

I've checked all the normal places for vacuum leaks.

The spikes in the LM-1 log look like rhythmic misfires to me. The uniform nature makes me think it's an ignition problem rather than a fuel problem. But having not looked at an A/F log before, I'm not sure if I am reading it right.