weird cutting out problem

Yeah, that's a little bit weird. I mean, how much load can you put the engine under in bumper-to-bumper traffic? Sure it's not just a carb stumble, like a bad accelerator pump? I've also seen (when taking off) the ported vacuum rotate the distributor point plate and mess up the point gap, causing a hiccup in the ignition spark. That's usually on a worn distributor or already worn/misadjusted points.