Anywhere electrical I should be looking 1st? Possibly immobiliser issue? I have plugged in my Delphi diagnostics, but that has limited ability with immobiliser. Key chip looks fine. I have been doing welding on cab to repair corrosion and yes I did unplug ECU plugs, is there anything else I could of upset? Doubt if it is rodents as I have been working on vehicle regularly and yard is well baited! Wanted to eliminate any electrical gremlins before pulling the fuel system apart.