I gather you got the car running again after all the "will not start" bs. Gremlins like this are a pain in the ass. Since the items you think might be the problem can be swapped into different locations i'd try some trial and error. Perhaps swapping a plug wire #2's with #1 or whick ever one, to see if the problem travels with the wire...same with the injectors or the plugs. the fuel filter is cheap but I'm pretty sure that wwould affect everything. This is a cheap method. Basically if you can duplicate the problem in the new location you can isolate where the problem.

Cahnces are you've already done this, if thats the case...sorry to waste you time mang.