Hi. I have recently purchased an Astra coupe turbo and the other day when I pulled away on boost 1st and 2nd was fine then when I hit 3rd gear towards the red line the car jerked and the engine management light started flashing and the car started losing power. The light then stayed on and when I stopped it sounded very bounce and unhealthy however when I turned her off and restarted all was fine with no light??? I really am too scared to boost hard anymore in case I make this problem worse. The car has had 1 previous lady keeper from 900 miles when she bough it from VX and I bought it with 87,000 on and is totally standard. Does anyone have any ideas???