well, if it's a 'bog' when you nail it, then it's probably too much fuel. what you can do is try to replicate it and allow it to stall, get out and pull a plug. if it's wet as hell, then you have your answer. btw: is this a manual or autotragic trans? you can also play a bit with timing and a bit more ignition, but i think it sounds like you're a bit over-carbed.