Hi there, My U model flathead always shuts off as soon as I open the throttle just a little bit. She idles well and when I open the throttle fast enough to go over the bad spot the engine runs well at high rpm as well. I checked the manifold for leaks already and thing it's ok now but the problem did not go away. I run a M-41 Linkert, which is not the right model but I believe this should not be the problem? Any idea, comment or suggestion is very welcome.