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black smoke on 1991 Dodge Ram Van B250

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
my van cuts in an out an has hevy black smoke coming from tail pipe and it is realy bad on gas
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Sounds like a fuel control problem, like a vacuum leak or a sensor issue. Have a diagnostic test performed that may focus on that area.
A diagnostic test only starts with reading codes. A 1991 vehicle is very limited in diagnostic codes compared to a current year model. Some good manual testing of fuel pressure, air flow, monitoring oxygen sensor performance and barometric pressure is a good start.