White smoke, misfire, knocking, rough idle after sitting for 3 weeks. Help?

[Anker]

Symptoms would seem consistent with a bad AOS. The smoke from oil leaking into the intake manifold. The knocking from hydraulic locks in the cylinders, or possibly preignition. I would worry a lot more about the knocking than the smoke.

[Paul]

Could be fuel fouled plugs from excessive cranking which cleared after idling for awhile.

Initial hard start might be the cps if the tach was not bouncing during cranking.

Could also be the first sign of a failing fuel pump or relay.

Regardless, as it has been said before Porsches will get even for letting them sit.

[Jamesp]

A small cloud of white smoke particularly after sitting is not uncommon. I've seen it with mine after sitting. I've also had mild bearing rattle at startup, and that is with 20k miles on the bearings. Not too sure what to say about the rough running. As it cleared up there's no real root cause. If it were me I'd continue to drive it for a few days to see if it repeats. If it doesn't give it a few weeks, if still nothing, a few months. Then it will be driving season again and your problem will be solved.