Help needed please - my tdci 115 focus has been running a bit lumpily in third recently and today when driving in traffic in I think 2nd gear at about 2000rpm, several times when I took my foot off the accelerator the engine ran on & even tried to increase the speed! Any idea what this means? I've seen various references on the web to injector recalibrating - is this likely to be needed or would it help to put some injector cleaner through the engine - I'm not sure if this is recommended with these engines ??

Secondly, I've been thinking about having the ECU remapped by a reputable firm to boost the rather naff low speed torque & improve fuel consumption, does anyone know if this can help the above problems - presumably they would look at the ECU and find out if anything untoward is happening anyway??

thanks