Any resolution to this issue yet? I'm getting a cylinder three mis-fire code, usually during extended idles, but I have gotten it during acceleration sometimes. I've done the coil pack switch (code remained with cylinder three), and installed new spark plug (code remained). I also seem to have a loss of power, but also have a pretty rough idle. If I listen to the exhaust it sounds like it's missing, but the engine sounds like it always has. Haven't done a compression test yet, and from the research that I have done the possible issues that I have found have been:

-faulty spark plug
-faulty coil pack
-faulty oxygen sensor
-faulty fuel injector
-burned exhaust valve
-faulty catalytic converter
-running out of fuel
-poor compression
-defective computer

Also reading around on the forum it may be due to a bad intake manifold gasket and/or bad IAC.

I really need to narrow this down, so any info from your experience would be helpful.