I've been getting an error code occasionally, namely 15.2 high speed crank (logged). Recently, it's been showing up more often. Reading on here and elsewhere suggests that this often has something to do with a poor signal from the crank position sensor. I tried shimming it out with a washer, and the car wouldn't start at all. Then I swapped it for a spare one that I'd taken off in January and the engine started. I've taken it for a run with some opportunities for a long blast where I can get up to 70, and the error hasn't returned, so maybe that's what it was.