Edited after seeing comment below.

The flights to/from EN leave from T4.

The shuttle between terminals does stop there, but I'm not sure if it runs more than 2 or 3 times an hour.

The good thing is that the small terminal should have small lines. Anyway, it's a bit tight. I'd hope for 4 hours. If you're already booked into MNL, idk, worth a try.