Fix your errors or you will regret adding the mod. I would pull out the opto boards in the trough and replace the opto sender/receivers. It seems to be a common problem. My deadworld mod worked with intermittent issues, after fixing the trough optos, all has been well (knock on wood). Be aware if you get sender/receivers from radioshack, be sure and read on the package which are senders and which are receivers. I believe they were opposite colors of what is currently in your game.