For about a year and a half my car has intermittenetly been badly misfiring when idling and more worryingly when I fully accelerate it starts to judder (quite difficult to explain, but something like me trying to accelerate in too high a gear, starts to sort of wheel spin, but if you keep the foot down it pushes on and then drives as normal). As I say it has previously been an intermittent problem, but in the last 3 months is happening on a daily basis. One thing I have noticed is that these problems only occur once the engine is warmed up. When starting from cold it runs fine for the first five minutes or so. My car is an ex fleet, and has done a rather xcessive 166,000 miles to date. Anybody got any ideas, any advice would be greatly appreciated.