1997 Honda Odyssey Van

when approaching a stop and slowing down to about 30-40 miles per hour the van begins to shake and sputter and when you try to gun it is jerks until it gets enough speed then levels out or acts normal. my honda master technician cannot figure out what it is. any suggestions would be appreicated.

Start with the simple stuff. When was the last tune-up performed (spark plugs, wires, filters, etc)?

all those things have been serviced while at the shop. my guess takes his time, is a personal friend and knows his stuff but this one has him perplexed. thanks for your quick response.