Welcome to my world. I've been having this problem (or similar) for quite a while now and haven't been able to get it sorted.
Does yours do it all the time when its hot or only off and on? It happens to my car occasionally but mainly when i'm cruising on the freeway or accelerating hard out of corners.
I have changed my coil with no luck, dizzy cap, leads, fuel filter and a whole bunch of other stuff to no avail. I am of the opinion that it can now be only 1 of 2 things. either the ignition module or the fuel pump.
I replaced my fuel pump with one I picked up from the wreckers and the problem got much worse. My mechanic tested it and while the fuel pressure was ok the fuel flow was crap. When he put my original pump back in the problem went away completely for a few days and then started happening again as soon as I started giving the car a bit more stick. As soon as I have the cash I'm going to put a brand new pump in and see how it goes.
I'll let you know.
Please post up here if replacing your TFI works as I'll be interested to see.
3.9 CFI Falcon. King Springs, Monroe GT Shockers. Formula 1 Tinted windows. Pioneer 3350 Head Unit, 12" JL Audio Sub. 6"-9" Pioneer 3 Ways, 4" Clarion 2 Ways, 500watt Schneider Amp, 222watt Sony Xplode Amp. Really shitty 14" Jelly Beans