[Trak Ratt]

Originally Posted by RV4Flyer

Carbon fouled plugs are due to a rich (too much air) not lean mixture. I'm not familiar with the engine but by adjusting the mixture you probably fixed the issue. If not it sounds like it may be uneven air/fuel distribution or an intake manifold leak. What is the cylinder layout on the engine? All even on one side and odd on the other?

So very true and that's why I suggested the problem might be on the other side Earlier turbos used CIS with lots of rubber and plastic connectors. Cylinder layout on that engine is like just about all the ather air cooled 911s. Left (facing forward) 1, 2, 3 right 4, 5, 6.

Now if you meant firing order...

Have to admit thought that after careful consideration I'm going with Hoops diagnosis