hi there. ihave got a fiat punto 52 plate. have just had head gasket replaced along with new canbelt, water pump and other accesories. drove lovely for 4 days. after refueling the car will kangaroo spontanulsey. have had a dionostic test and it picked up nothing was wrong. i have put it in two different garages and they are baffled. when it starts to kangaroo if i press the clutch down it stops. as soon as i take my foot of the clutch she kangaroos again. whats the problem.:bang: