The other day after a lot town driving I noticed the normal biting point felt like the car would stall and a slightly hesitant and vibrate. Therefore required more throttle. I also notice sometimes when I come to stop and move the gear neutral it makes a slight vibration again like it make stall. But there is no drop in revs. Anything I should check? I have vcds so I will do a scan. The onboard computer says the car is "OK".