My Chrysler Voyager 2.5 diesel 2001 (y reg) cuts out at idol/low revs and the idol speed dips and rises on its own without touching the accelarator. I am particularly concerned as sometimes the engine cuts out when pulling away from a junction and leaves us stranded in the middle of the road. A local independent garage has suggested the injectors may need replacing but they are not sure and we do not want to pay for guess work. Please help!