the problem first appeared six months after i bought the car 2yrs ago, after running out of diesel. the car would randomly go into limp home mode and accelerate slowly and peek at 2200. i took the car to dealers and they refused to work on it as 4 copper wires were spliced into loom and joined into an extra earth. when i picked up the car the problem had gone?? this problem very occasionally reappeared but only when using cheap diesel and would gradually dissapear. About 2 weeks ago it came back and now seems more persistant but i did run for 5 hours on hols this weekend and only stuttered briefly as i arrived but then cleared for 2 days. but on the way home it was permanently there but for maybe 1-2 or 3-4 minut bursts, and going through the gears it was okay in some not others. it also idles occasionally at 1200 then slowly drops to normal and this morning it started grumpy but an hour later ran okay for a short run??Anyone with any ideas?