Intermittent power loss

[Tony Radford]

I've got one of those pesky intermittent problems I need to fix, but I don't know where to start. 99% of the time, everything works great under any accelleration condition. But after I've been sitting in stop and go traffic, the engine will stall for about half a second, usually when I'm shifting between first and second gears. I can't tell if it's fuel or spark related. I'm running an MSD 6A and double pump mechanical carb. I've considered vapor lock, but the water and oil temps are well within spec. For the first time, It did it while leaving a restaurant last night after sitting for a couple of hours. During a "spirited" exit from the parking lot, it felt as though someone turned off the key when I clutched at the end of first gear. It was only for a split second, so it recovers with a lurch into second gear. I have an aluminum flywheel, so the problem is particularly obvious.

I can't see it being a fuel filter since it runs great at high speed for hours at a time. The braided fuel line doesnt seem to be getting hot. The MSD box is located on the firewall, but it's been that way for the past 30K miles. This anomaly has only existed for a relatively brief period of time.

I know it's not much to go on, but I'd like to see some comments before I start ripping stuff out.