I have bought a Mk4 1.8 Sport for my girlfriend. It's a 1999 S reg model, 5 door. When I drive her car and come to stop at light and stuff the cars rev counter drops right down and comes back up again, and when parked up it's moving slightly up and down. It cut out on me the other day when I came up to traffic lights. When re starting it, it sometimes takes a little while to fire up. It's normally a good starter, straight off the key. I changed a few parts under the bonnet to see if any parts had broke ie AFM (air flow meter) and Coil Pack but it's still running poor. The revs on the car just want to drop all the time when coming to a stop and sitting normal in traffic. Apart from that the car drives fine. Cheers for any info.