Hello all,   Bit stumped - wonder if anyone can help me? Car is suffering a rough idle and also occasionally cutting out when coming of the throttle and coasting into a stop - not every time though; the revs sometimes dip almost to 0, and then jump back up to normal - other times the car will stall. I do have fault code P1283 which I know may relate to one of the upstream O2 sensors, but I'm not convinced (yet) that the sensor is necessarily the problem.   So apart from the c