I know this is a little bit of a ghost that I can't see just tracking down but worth a shot. Recently when I come to a complete stop at a stop light, I hear and feel the slightest little thump. Kind of like when something slides forward in your bed and hits the front of it. But its much more faint and not nearly as violent. I don't notice it if I'm just going like a few mph and then stop but if I'm doing like 25 and slowly stop when I fully stop it happens. I almost think its something like the torque converter not unlocking but I really doubt that. I can't say as far as the engine if it bogs at that point, its too damn quiet with that stock exhaust and I don't really notice anything by the RPMs but it idles at 600 RPMs.