2500 lly: ts performance mp-8 installed and having trouble with shim kit. got bracket off for glow plug controller, and trying to remove bolt on back of fuel rail. It is seized up and will not back off. I am afraid of stripping this thin bolt out. It is 12am and we are tring to get this knocked out tonight. Thanks in advance for the help on this guys.

i know somebody can help with this.. my truck has been parked all weekend juist becuase of these shims.... can someone please give me some pointers on how to get this fuel valve off.

You have to put two wrenches together to break it loose. Extremely tight. B sure you put it back the same way or you will set a low rail pressure code.