vivaro van trouble starting when damp and conks out ?

hi seems to be the same questions im having probs stating my vivaro van 05 1.9 having trouble when damp or raining no other problems when dry broke down befor and called aa out he checked his computer and it said wiggle wires from ecu to engine and it started ran for 10 min .then took me to vauxhall dealer they had it 2 days couldnt fint anything wrong with it but still cuts out when damp could it be glow plugs or bad connections
thanks