after a month of my car cocking about(02 172) and people trying to tell me whats wrong with it ie.lambda sensors,coil ,plugs. I got a diffrent technician to look at my car and he actually took it out as the other one could'nt be arsed within a couple of minutes he diagnosed my problem which turned out to be a dodgy connecter to the tdc sensor.After pleading poverty to one of the directors he told me to give the technician a drink and just pay for a new connector £14.00 and now its running great.