Filled up with fuel yesterday left forecourt car cut out whilst waiting for lights to change (car in D position) swithched off engine put in P etc etc tried to restart car which it did but when revs went back to 5 it cut put again tried several times but to no avail.pushed car to side and waited for mechanic to ring us after 5 mins tried car again and it started ok and managed to get to mechanic to find the fault.any ideas gratefully received!!!!!!!!!!!!!!!