Are Boxsters always this unreliable

[Jamesp]

Grumpyfarmer, I'm in the USA, worse still, Texas, so you'll have to pardon my English. When I hear High idle, I'm thinking either vacuum leak, which would come with a check engine light, or an open throttle plate. Since you did not mention a CEL, I'm going with checking the position of the throttle plate. My first guess, since the idle is high but not in a steady state (1400,then 1700, then 1500), is something pushing the gas pedal? Maybe a floor mat? Barring that is the pedal sticking? Have you tried pulling the pedal back to lower the idle? If all of that fails you're in to opening up the engine compartment and fiddling with the throttle body to see if you can move the throttle plate to idle. If this is your primary transportation it's a big deal. But again as a farmer, you can fix any machinery in your sleep.

[grumpyfarmer]

Hi jamesp

Had a look at the and the floor mat is not stuck under the peddle and it is not sticking.Looked at the engine and there is a little play in the throttle cable so there isn't any thing restricting it from the peddle to the throttle plate i take it that's whets at the other end.
Is there any way i can adjust it the engine end?

[Jamesp]

I have an e-throttle so no cable for me. On the play in the throttle cable, can that be there due to the throttle plate not fully returning to idle? Can you manually rotate the piece the cable attaches to towards its idle position? Adjusting something seems a little fishy. To me the symptoms make it seem more likely something is sticking rather than something needs adjusting.