car keeps cutting out?

my zafira stalled at traffic lights, since then management light on dash came on and car would not idle when stationry, got diagnosed and replaced idle control valve still got same problem so changd throttle body, car still has management light on but idles ok, when driving does not run as before feels sluggish as though engine being starved of fuel, can u please advise on possible cause. car reg is w plate 2000.