are the focus se and zx3 have the same flywheel

Have you checked all the sensors and valves to make sure they are all clean when you swapped in this zetec? Sounds like you might have to replace some of them. And sure you check the timing of the engine as well. Good luck~

Excellent answer by Stephen, I's start with the timing. You may want to print this, then copy at 200% or so to see it properly

AS for your original question, the Focus SE comes with a 2.0ZX3 engine, so i don't quite understand what you are asking