you also might have a clogged injector... or just a bad one. I did an H22 swap into a EG Hatch that was having that same exact problem. I switched out the injectors for a totally different set and it corrected the issue.... When you do your compression test it should help you figure out whats going on in your motor. Another thing to check though, pull the spark plug out of that cylinder after it's run for a few minutes and smell it to see if it has a fuel scent to it.

-Drew