Could anyone tell me the problem i could be having, i started my Ford Focus diesel 2001 model, it started ok but as i drove of the car lost power and sounded like it was missing, i noticed through my rear view mirror is was blowing alot of blue smoke, then the car stalled, i got it towed home and it started ok plus idles fine, but when i rev it there is alot of blue and white smoke and sounds like it is missing still , i have checked to see if the head gasket had gone but seems fine, any help will be great. Ian