From time to time, when I am at a stop, my punto mk2 (1.2 8v) wobbles a little and the rpms go down(lets say from 900 to 800). If it adds to the problem i'm gonna say i also got bad gas mileage (something like 8-9-10 l/100km) and my exhaust sounds like burping gasses at one of the exhaust connection under the car when the car wobbles.I got the car for 6 months now and I have yet to resolve this problem.