I just got my 2E engine swapped with a 4-AGE Black Top engine in my '93 Corolla XL. I am impressed with the engine's power and I enjoy driving it in NLEX until I noticed that it would have an occasional "hiccup" or "engine jerk" specially in the 4th and 5th gear. Also, I noticed that sometimes the RPM drops too low during gear change and at one point it even made the engine stall. Any idea what's causing this and what should I do to correct it? Thanks in advance!