I've been having an issue of high idle for the past few days now. It doesn't happen upon initially starting the car but only after its been running for around 5 minutes or so and only in Park and Neutral. I don't know how high the RPM goes up to but I would estimate it to be around 3000-4000 so its definitely not something I want to drive around with because of the stress it will put on the transmission. Anyhow, I'm just wondering if anyone else here has previous experience with something like this and what the solution was. Any help would be much appreciated.