!952 Mercury with 255 Flathead V-8 Will Idle But Not Gain RPM.

[Chuckwin]

It is a completely original 6 volt car with the original "Teapot" style carburetor. The car starts and idles okay, but any applied throttle more than say 5 percent and the engine will stumble harsly and die if not released.

The coil is a known good. The voltage regulator has been replaced. The spark plugs and ignition wires have been replaced. The distributor has a new cap, rotor and points. I've used a known good condenser. The carburetor seems to being administering a decent amount of fuel, and adding fuel directly into the intake does nothing to alleviate the issue. The vacuum advance holds under a vacuum test. Messing with the range in the timing of the distributor does very little.


The car ran fine for some time before this problem began. I have unplugged all vacuum from the engine save the advance, although it does leak oil from the rear of the intake. Any advice or further questions would be very much appreciated.