I had recently changed my cats, O2 sensors, IAC, and egr. Now when my SUV is at operating temp and at a stop, it wants to act up. The RPM goes to 500 90% of the time. Every now and than it goes to 250. I was wondering if anyone could help me out?

 

I am having a similar problem. Works fine when cool, but 500-700 idle rpm and no power. Replaced coil and plugs, cylinder 4. Not sure what to tell you.