ISUZUtrooper-1997model.shows check engine on each 50kms run & engine stops

What is your question?

while slowing down after 50kms,if applying clutch for slowing down from 100mile speed to 30/35 mile speed,the engine always getting off. if we starts it again, it works and repeats same problem two three times. Then it is ok for another run up to some more kms & shows "check engine".No starting complaints ever experienced.speedo meter not working. no other complaints. help me with your valuable advice. Hari, Muscat.