I just bought a 1992 Mazda B2200 Carburated 2.2 liter pickup. Shortly after I drove it it started to " what I call fall on its face", backfire, really has no middle range. Idles ok, full throttle is ok, but normal accelleration is weak and sputters, wants to die unless I fully gas it; or let off completely. Please help with any information you may have for me..Thanks
Brian