One of our '99's suddenly jumped up to 2500 rpm idle upon being restated after being shut off after a 150 mile run. I had to run it for a while before the rpms would drop back down to 750 rpm idle. It was virtually uncontollably running very high up. The problem has since subsided but it was kinda freaky at the time and sounded really stupid shifting into Drive at 2500 rpm with my foot on the brake (I was dropping my wife athe airport and had to open the cargo door with the ignition key, you know no door popper and then restart to pull away from the terminal.) Any thoughts? Thx