I've recently acquired a 1979 Mini pickup. It has a 1275 engine, and now, a new HIF 44 SU carb. Installing the carb brought immediate improvements in running. Dialed it in as best I could after the engine warmed-up. If I try to accelerate fairly hard, the engine seems to fall on its' face, unless I've got a bit of speed. If I release the accelerator slowly, the engine speeds up nicely, but if I put my foot back into it, it falls again. If this was a different car and engine I would want to have a look at the accelerator pump on the carb. Anyone have any ideas? It almost feels like a two stoke motorcycle not quite being on the power band.