Hi all, I have a fiat doblo 1.6multijet 263 diesel van 64 plate that I recently bought with 46000 miles on it. The van idles fine but frequently revs a little high 900-1000rpm. If I gently put my toe under accelerator and pull it back the idle drops back to the usual approx 800rpm (doesn't feel like it has moved but returns the idle speed to normal) any help please on what this may be would be much appreciated. Is it just a faulty pedal/switch or something more sinister....