Well the first thing i would do is google kinsler fuel injection. If you dont have there bible you need to grt it. I'm pretty sure they have it online now. They are easy to talk to and they sort of wrote the book in fuel injection.
I havent heard anything about barrel valves yet they get out of wack pretty quick. Probably fuel fouled plugs by now get a torch and using very small flame try to get down inside and heat them up. Good luck