I bought cheap fuel from same garage twice now. The first time, the car wouldn't start until the next day - when it ran also fine. Yesterday, I bought fuel from same garage - and today the car has no power, and the engine management light is flashing. I have a small ramp up onto my drive and even in 1st gear it was a struggle.

I already have a mechanic booked in for tomorrow to change cambelt and tensioner, but I am now worried about this new problem...