When we pull away from lights or junction the camper jerks quite badly until we get going. It feels like the accelerator return spring (if there is one) is missing. Also when idling the engine RPM starts to creep up from 750 to 1500. All the local Fiat dealers are fully booked next week and we leave for France at the end of next week. The engine is the Fiat 3.0 ltr and its a 2009 model any suggestions would be very helpful