Rpms not dropping

[brp987]

Bentley Boxster Service Manual, page 24-6:

DME adaptation for throttle unit can be done if these conditions exist:

vehicle stationary, battery > 10 V and < 16V, engine temp >5C and <100C, and
intake air temp >10C and < 100C

if the above are true then:
1. switch on ignition for 1 minute w/o starting engine

2. switch off ignition for > 10 sec


now see if it's fixed (pray...)