EL falcon which seems to be getting progressively worse idle since (I assume) replacing the camshaft last year (see my gallery). Its getting annoying now so I hooked up the timing light to each cylinder, none are rock solid - but 2 is all over the place!

I assume this an ignition problem. Can fueling cause a misfire at the plug?

Change the lead, as in swap it with another one, say cyl3, and if it goes to that plug, you found the problem, process of elimination.

Cheers mate that was my next course of action along with a plug swap. Not trival on a falcon when you have a broken clavicle

My original question still stands though, can fueling alone cause small or no spark at the plug?

I wouldnt think so, unless you got a dodgy/clogged injector.