Over fueling/ return fuel line?

  1. #1
    Rite my car I think is over fuelin, I've bloked off fuel return as I was told todo so on here and my plugs blow everytime I start the car and wen I changed plugs I drove it and it had no power then checked plugs and again there bottoms were burnt and black,
    Am I right in thinking my cars over fueling and I need to put return fuel line in and change plugs and will be fine or if I'm wrong someone please help