That could be any number of problems. Anything from bad fuel to an ignition system problem to a fuel system problem,etc. The list goes on.
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check plugs &wires
Spitting and sputtering while driving often indicates that the engine is misfiring or not running smoothly. This can be caused by issues such as faulty spark plugs, a clogged fuel injector, or problems with the ignition system. It may also signal an air-fuel mixture problem or issues with the exhaust system. If you notice these symptoms, it's advisable to have the vehicle inspected by a mechanic to prevent further damage.
Bad gas, fouled plug(s), engine out of time, vacuum line leak or clogged.
There are several things that can cause your Ford E2 50 Van to hesitate while driving. The most common cause is a malfunctioning ignition switch.
fuel pump
It may be the fan belt.
I can't tell much from what you've described but it sure sounds like either a fuel filter or a failing fuel pump.
If you have water in your gas line, this may be a cause for sputtering (simple scenario). If so, get some HEAT or product to assist evaporating the water in your gas. Good luck!
The Synonym for sputtering is stuttering.
The belts on the pulleys or the alternator are probably worn, or they may be contaminated with oil.
Building of a Driving Van Trailer instead of another locomotive is just but a method to keep the budget low while building trains.