I had my 52 reg 1.4 Sport MkIV Ibiza fully serviced and MOTed about two weeks ago and I started her up today to find the engine warning light flashing and the ride lumpy and with generally lower power. I was told that they replaced all 4 spark plugs during the service and I understand that this can cause the coil pack to go? Does that sound about right? I can get hold of a VAG COM system - will that be able to tell me if it is the problem? If it is, how much should I be paying to get a new coil pack fitted? Thanks in advance! EDIT: It's done 111k miles by the way.