I have been having a problem with a Langdon Holley/ Webber 2 barrel carb set up. I purchased it in 2005 as a complete set with an Offenhauser manifold to install on a 235 straight 6. It ran fine for years, but recently has been stalling out with a load on the engine. Even a relatively small hill will stall it out.
I had the carbs rebuilt. It has an electric fuel pump added. All the lines have been checked and are clear. Fuel pressure is 6 psi.
I finally brought it to a performance shop where they put it on a diagnostic machine. As the put a load on the engine and got the rpms up in the 3,000 range it starts bucking starving for fuel.
The only thing that worked to stop the bucking was to spray carburetor fluid directly into the carbs which would smooth out the engine immediately.
The performance shop is at a loss as to what is happening. He said it was definitely in the carbs. He even tried to isolate it to just one carb, but it still did the same bucking starving for fuel. He thinks it is something in the carbs.
Anyone seen this type of a problem? I am to the point of replacing the carbs with two single barrel Carters.