Hey guys so recently I've begun to notice when I'm decelerating and push in the clutch the rpm bounces around between 500 and 700 rpm and is very rough. I can feel the shake in the pedals and in the car however it is only for a couple of seconds then the rpms level out at around 600. At first I chalked it up to bad gas so I switched to 93 octane and still have the issues. Is this something I should be concerned about or is it typical? The car has never died in neutral but there were one or two times when I thought it was going to.