hi, i recently bought a fabia 1.4 16v 2000 reg from a small trade dealer, after me visiting the car 70 miles away and putting a deposit down he told me there was a small problem with an erratic idle ( the car revs between just below and above 100rpm when stationary ). he then said he had cleaned the throttle body & sensors and said car was fixed, so i bought it, drove it home, since then this is w