There is no way to tell what your problem might be with out detail checks but it does sound like the vacuum advance is not working correctly. Since you were replacing vacuum hoses I would double check the routing and be absolutely sure it is right. Another thing, I have mentioned it several times and I suspect people are leery of Marvel Mystery Oil for the fuel system. However, the chemical in it is an excellent solvent when warm. The K-Jetronic fuel system is a constant circulating system and that stuff will clean a fuel system when nothing else will. It may take a tank or two of fuel but if you haven't tried it you're missing the cheapest tune-up in a can you can get. Harold McElraft - 3354