Dream Theater

Here's a weird one for you guys. When I'm driving sometimes and i come to a stop by clutching and braking, the car just dies and cuts off... Also when im in reverse and I clutch it the car does the same thing... Any ideas? I just replaced the master and slave cylinders and i mean it doesn't happen all the time. I'd say 1 time out of every 30 sudden stops... Sudden being 60 to 0, but not slamming on the breaks. Almost like a skid pad test.

Any ideas, or am I being a little vague....?