1993 mazda b2600 4×4 smokeing and missing. Clouds of blue smoke.
Oil leaking into the combustion cycle, burning with gasoline and blowing out the exhaust. Leak could be valve guides, or if it's a lot, could be bad piston rings, blown head gasket, or worse. This is what's causing the misfiring. By now, you've probably destroyed the catalytic converter. Power loss is probably what's preventing the 4x4 from engaging.
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