I have a 5th generation, British edition, i assume series 80, VX Cruiser with an auto transmission. When the car is pulling off it is extremely sluggish and suddenly when the revs slowly rise, at around three and a half it will suddenly gain all its power and it feels like a turbo boost. Otherwise standard 1300 engines can pull off faster than my car. It seems like an electrical problem because it can get worse or better, sometimes when battery is disconnected or flat. The timing has been checked and currently investigating a fuel starvation scenario. Any suggestion?