In the last 2 to 3 months, so from about 20K miles, my 1997 159 2.4 210bhp has developed a sort of misfire especially under light throttle settings at around 2000 revs. It can happen in any gear from 3rd in traffic right through to 6th on the motorway, infact it even did it on cruise control the other day and I had to intervene with a slight throttle input to stop it. It is intermittent in that I cannot recreate it on demand but it seems more likely to occur under load like a slight incline. I get no warning or error lights coming up when the 'misfire' happens. As I post this I am in France having covered 1600 miles in the last week with much of that on almost empty autoroutes so it has certainly had a good run but the problem persists. I'm planning to talk to my dealer when I get back to UK and threads on here suggest EGR valves or fuel filters may be a starting point. Has anyone else had these symptoms and found the cause and even better a fix?