I just changed my spark plugs yesterday, and started my car today. I noticed that the car was automatically giving gas on my safc 2. And my rpms were at 2100. Usually at 1000 on a cold start. Then I drove it around for awhile and the rpm was still the same. When I got back home it started to fluctuate at idle then stay steady. Any ideas?

 

Probably time to change the iac, it's a known failure point on the 8's.

 

Test the Tps before you replace it with a multimeter. It could also be a vacuum leak. Do a boost leak test if you suspect a vacuum leak.

 

cheak your vacumme lines and pull the pipe/coupler to the throttle body. if there is build up it can cause the throttle to stick slightly.