okay so i got my carby tuned about 3 months ago and it was running great, nice and responsive and no smoke. But lately i have been having a lot of troble with it running very rich. it is almost spitting fuel out the exhaust and the smoke from it has been very dark and getting progressively worse. I have played with the idle and fuel mixes but this made no obvious difference. i also took the carby apart and cleaned a lot of the old parts and it appears that this may have helped slightly. If anyone has any input on what they think may be causing this problem to my A15 then i would really appreciate it