Have a 2007 VW jetta 2.5L and had what I thought was a wiring issue and would not start. It had been sitting in the shop for 2 months and they went over everything and couldn't find a bad wire. So I snagged an ECU from a part out and threw it in and it fired up. It won't stay running and throws up an Immobilizer error. Whats the best way around the Immobilizer.