Originally Posted by
Six_Shooter
Well, you have us at a disadvantage, we are telling you everything that could possibly be causing your issue and you're telling us that they are not it.
If it's not the FPR, or an injector not closing (that would also require the intake valve on that same cylinder to not work either), causing raw fuel to fill the runner and then make it's way to the throttle body, then you will have to tell us what it is.
The only other thing I can think of would be that something is installed incorrectly, involving the fuel system. But without seeing the car, it's only speculation.