ISUZU MU 91 petril..Starts and then stops

My 91 petrol ISUZU MU starts fine but dies after about 2-3 seconds. It will restart repeatadly but continues to stop everytime after 2-3 seconds regardless of revs. Any ideas re possible problem or where I
could get wiring diagram as I suspect its not a gas problem. Thanks in advance. :(
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Terryj wrote:

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