So I've been searching for a Saab estate for around the £2000 Mark and have found one from a guy selling it on 78k miles. I test drove it yesterday and it drives very smoothly. I did however come across a couple of issues but I'm not sure how serious they may be. Firstly, there occasionally popped up a warning line stating water in the fuel. The guy told me not to worry about that but I'm not certain. Is that a common issue? Secondly, they're a a clunking noise from under the car whenever we went over any bump, accelerated hard or brakes hard, almost like there was something in the boot? Has this happened to anyone before? Any help/advice would be appreciated, thanks!