[63roach]

1963 suburban, all original 305E with a really nasty dead / flat spot just off idle. Its difficult to describe via text the stumble / dead / flat spot is sharp and sounds like it is SUDDENLY starving for fuel or fouling a couple plugs or??? This truck sat for 20+ years. We cleaned the tank, replaced rubber fuel line, rebuilt the carb, flushed the cooling system, primed the oil pump, and changed the oil. The original fuel pump was already replaced with an electric one long before we owned it so I also just replaced the old pump with a fresh, new electric one.

It ran like a champ for 1000 +/- miles but has developed a dead spot that occurs just after the accelerator is pressed slowly. If the accelerator is pressed quickly to the floor, the dead spot is non-existent or so slight that its hardly noticeable.

Thinking the issue may be timing related (and wanting to convert to HEI anyway) I ordered a new HEI unit custom built for this engine by HEIDIZZY in Woodruff SC. Installed all new plugs, wires at the same time.

Purrs like a kitten at idle but still has the flat spot just off of idle... What now, rebuild the carburetor again? The issue did not change at all withe the new ignition system.