The only other thing I could think of is your valves. They could have oil erosion build up. Mitsu's are nortorious for having this prob. Maybe wen the injector squirt the fuel in, the valves stay open for far too long over flowing the chamber with fuel....? It's kind of hard to say with out actually looking at the motor its self...So far the is the oly thing that comes to mind...Let me ask around and see what comes up
