Have you checked the catylitic converter? Had a Datsun B210 that had the same symptoms. Took the converter out and the honeycomb would clog after 20 - 30 minutes driving. Just a thought!
No
all the students would have to restart their test
No, it will not.
because itt needs to be work on
A sparkplug misfiring.
You can't, you would have to restart the whole game.
Yes it can.
Incorrect ignition timing or damaged valves would make a 95 Honda Odyssey sputter and backfire. Backfires are directly caused when ignition occurs at the wrong time.
ice in the fuel system
have you ever changed the fuel filter ?
lack of fuel
Timing belt