Hi Folks, I have a 1998 206, 1.4 GLX (8 valve). Recently it has started to miss-fire when warming up. It seems to reach about 3000rpm then hits a mega flat spot throughout the rest of the range. Initially I thought that a plug / lead might have been tracking, but I am now concerned because the oil cap is coated with mayonaise, and the coolant has gone a nasty brown colour. The miss-fire goes once fully warmed up. I suspect that the head gasket has gone...would you guys agree, and how difficult a job is it to change it?, the last head gasket I changed was on a Metro (A series!). Cheers Craig