We recently changed the ecu on our vectra 1.8ls 2002 it started and ran fine for 10mins then then stopped,i think the immobilliseron all the time,how can i take immobilliser off

Easy way is to join the immobiliser wires they work like a toggle switch otherwise replace distributor just be sure not to connect the imob wires to distributor. worth tracing wires to distributor should be one wire in and one coming out of distributort to immobiliser (not to coil or battery) cut and join them immobiliser is off then. Make sure you leave enough wire in case its not the problem so you can just wire back to normal.