Today I noticed that upon taking away my foot from the accelerator ( and pressing the clutch) the revs came down (as normal) but then gradually increased during a few seconds to about 2000 rpm This happened a few times. One time I saw that the rpm slowly came down again. Also, the normal idle was not exactly stable on one occasion. Engine was warm and running fine otherwise. This is on my 3.0 L 3V6 Roadster from 2009. I did not notice this behavior before. I was in traffic and could not experiment any further, also it occurred only a few times.
Any ideas why this happens?
Thx,
Bert
