Hi all. A little while ago I posted a messageas my Sportage only runs smoothly when the air con is switched on.I can't findmy postingin the forum history so don't know how many people have looked at the posting but somebody did suggest that it may be linked to the EGR Valve. I have had a new valve fitted earlier this year when thecar suffered a complete loss ofpowerand the dash warning light came on to suggest it was faulty. Another member asked how much a valve is. A valve and gaskets was £312.00. Pattern valves do not seem to be avaiable yet. My missfire still exists so I guess I'll just leave the air con switched on unless somebody knows how to cure the problem!