I've skim read what you've said.. Does fuel come out of each injector evenly? Does each plug have a healthy spark? Is compression similar on all cyl's (and high enough)? Its a turbo isn't it? If you have all of the above I'd be looking at anything else you've touched in the process of rebuilding it.. Everytime I have a prob I suspect the kjet, but it never is, its always something else, so I'd imagine if all you've done is remove it, then reinstate it I'd imagine nothings broken without being touched, unless you're convinced its a fuel issue as per pressure relief valve... Its hard to say without seeing it myself, and going through the basics. Timing is the main problem I get, when the cranks I've had have failed, and then a million different symtoms come along (including starting) that all stem back to the belt being 2-3 teeth out!