I have a 2007 Volkswagen Golf GT Sport Twincharger 140 with 54,000 miles and full VW service history. Whilst travelling at 20mph for 4-5 miles on minor roads on holiday in Wales (with blind summits and bends) I made an emergency stop and stalled the engine. On re-starting, the lambda exhaust probe warning light came on. The car drove ok for the next 20 miles, then suffered a loss of power and began idling roughly.

I took it to the nearest VW dealer who diagnosed a turbo recirculation valve fault and replaced it. Still same problem. They then tried coil packs from a donor vehicle. Still no difference. Checked compression 1, 3, 4 cylinders: 11 bar; 2: 13 bar. Then they said don’t drive with this misfire and power loss, we haven't time to fix it. I ended up having it recovered home (250 miles away). What do you think the problem may be? This shouldn’t have happened at this age.