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.
see CarTalk.com
check plugs &wires
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 belts on the pulleys or the alternator are probably worn, or they may be contaminated with oil.
The Synonym for sputtering is stuttering.
Building of a Driving Van Trailer instead of another locomotive is just but a method to keep the budget low while building trains.
check distributer i had the same problem oil got into the distributer and messed it up whenever i went to a like 3 rpm then the car wouldn't run after sputtering for awhile