High Idle

'95 Aurora with 235000 miles. I had something new happen the other day. It had been sitting for about a week and I when I started it the RPMs seem to be normal but when I headed out the driveway I noticed they started climbing a little, by the time I got to the main road it was like the cruise control was on. I was running down the road doing 65 MPH and not giving it any gas. I pulled in at the corner store and had to stand on the brakes to make it stop. At a stop, in gear, it was idling at 2200 rpms, putting it in park took it over 3500, I turned it off and on several times but it stayed like this, the RPMs ran from 3000 to 3700. The next day I decided to see if I could fiind what the problem was, but when I cranked it up everything was normal. It's been about a week now and it has not reoccured. The engine light did not come on (not that I have a way to check it) and I checked, the cruise control was turned off. Thanks

'95 Aurora with 235000 miles. I had something new happen the other day. It had been sitting for about a week and I when I started it the RPMs seem to be normal but when I headed out the driveway I noticed they started climbing a little, by the time I got to the main road it was like the cruise control was on. I was running down the road doing 65 MPH and not giving it any gas. I pulled in at the corner store and had to stand on the brakes to make it stop. At a stop, in gear, it was idling at 2200 rpms, putting it in park took it over 3500, I turned it off and on several times but it stayed like this, the RPMs ran from 3000 to 3700. The next day I decided to see if I could fiind what the problem was, but when I cranked it up everything was normal. It's been about a week now and it has not reoccured. The engine light did not come on (not that I have a way to check it) and I checked, the cruise control was turned off. Thanks
my 2001 Aurora does exactly the same thing! did you ever get your issue resolved? If yes, can you share the soluation?

One of two possible fixes: 1. TPS sensor, 2. IAC sensor most likely sounds like a TPS sensor though. goodluck