Well i dont think it did but he said due to previous experiences he drove it not me so i took his word i did see the revs look a bit jumpy but just assumed that might be normal? And the fact it was cold might have helped. It seemed to only happen after it got hot on the way home. I mean i was averaging 40mpg sitting at 55-60 all the way home lol so ita not like i went drifting it was only when i went to over take a lorry that i npticed it and it just got worse after that so i just stuck cruise on and sat at 60 for the last 80 miles of my trip back. I did get a little suspicious when the ' can you smell the burning smell thats where a carrier bag got stuck on the exhaust' but couldnt smell anything at the time so assumed it was ok haha. Call me gullable i suppose. But i was too zed happy to care at the time. I dont know where i stand as for asking for money back? As technically i did say yeah i like it and paid for it?