The gearbox failed on my Feli 1.3L (AMG engine - 135B - 40KW). I have another Feli 1.3LXi (AMH engine - 136B - 50KW), so I put that whole AMH engine in the 1.3L body but it will not run properly with the 50KW ECU??? If I put the 40KW ECU back in it runs fine??? Do I need to do something to make the 50KW ECU work with its own engine?