Went out yesterday to see what happened to the engine when put under pressure. It drove well, steadily pulling through the gears to about 3500 revs no problem. As soon as i put it under pressue, overtaking, it coughed at 2700 revs and the coil light came on, limp home mode. Turned it off, then on again, back to normal. Going back in the garage next tuesday, looking at the egr valve, seals on fuel pipes and getting the codes read off computer. Its getting very frustrating . Will let you know the outcome, fingers crossed we can get it sorted.