kinda sounds like the problem i was having when one of my injectors stuffed up....
tested everything even compression, sparks etc...
eventually i took the 2 bolts off the fuel rail, moved the rail back... took the injector out, put it in another cyl and then that cyl was missing.. i tested the injector with a multimeter and it had no current flow through it either...
was damn annoying, had a slight miss here and there, then a consistant miss, then just started the car and it sounded like a rexxy haahah