97 Escort Misfire

It's been misfiring on and off for a few months now. No other code than cyl 4 misfire, I clear it and three days late it comes back.
New plugs, wires, coil pack. I changed the timing belt 4 months ago but it didn't misfire untill a month later. I'm not sure whats with this thing, however, look at these modius screen shots the spark seems to be advanced 27 deg? is this normal?

http://users.adelphia.net/~marussell/escort/DSC00167.JPG

http://users.adelphia.net/~marussell/escort/DSC00168.JPG

http://users.adelphia.net/~marussell/escort/DSC00170.JPG


Any ideas?

No ideas?

Maybe the new wires are bad

have you checked the fuel injectors?
it could be a problem with them