Right guys. After work today i carried out my service replacing: Oil Oil filter NGK7 spark plugs Magnecor 8.0mm Ht leads Distribuor cap Rota arm. Everthing went fine although a little oil went on the aux belt whilst removing oil filter, i cleaned the oil as i didnt want it to cause any inconvenience. I later drove to my mates house nd went to grab a bite, On the drive something didnt quite feel right as the revs were rising a little faster than the speed on an occasion. I knew something was wrong as the car felt as if she wanst reaching her optimum, even after the service. I then later cleaned the aux belt to make sure there was no excess oil floating around, which there wasnt. Drive back from the M25 - the engine management light came on, car was driving fine with the slight rev stepping faster than the speed. I have now put her in the drive to see what i can find for tomorrow, must be something that i must have moved maybe? What can it be guys? I had to remove the Intercooler and so on to carry the service... Have i knocked a sensor somewhere? Thanks in advance