need some help pleeze, i just fitted a brand new coil pack, leads & plugs, i have also cleaned the throttle body, 2 days ago and went for a drive, perfect drive and idle no problems went out today with the missus, after about 10 miles of driving through light london traffic the car lost power, started overfueling (black smoke strong smell of fuel), idle was eratic and lumpy this went on for 5 mins then fine again, on slowing down for a set of lights the car just cut out!! restarted and carried on driving fine, got home this evening (car running sweet all the way) after parking left to idle