Hi there been having a problem for some time now with my car hesitating sometimes its fine some times it really anoying!!!!!! Changed plugs, leads, fuel filter , air filter, trottle positon sensor, tempeture sensor and stat and still no joy it is driving me Mad!! Sometimes it will go really well it will excellerate really quickly and pull like hell in every gear and sometimes it wouldnt pull you out of bed its that bad!! tryed different octanes of fuel. Thought about injectors sticking as they sound quite ticky not like the 850 that we had. Engine oil smells like there is fuel in it? Had it plugged in at Volvo and they couldnt find anything wrong with it. It usally plays up after about 30 miles or when we have been sat in traffic please please can some one help me feelin really down about it thanks all Ben .