It worked very well today, with one exception. When back from work (engine at normal operating temperature 87C), the car did not go back to normal idle (approx. 650-700 RPM in park or neutral). It sort of oscillated between 500-900 RPM for about 15 seconds before settling at normal. It did it several times, in intervals of about 3 minutes.
What should I look for?
1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car