Has anyone noticed on their Hemi that after coming to a stop, the tach drops to 500 RPM. A slight tap on the throttle will bring to 600 where it will remain at that speed from then on. Also, if you shift to neutral and back to drive, the RPM will rise to 600 and remain there. Idle speed is always at 600 after initial start regardless of gear selection and only drops to 500 after driving and coming to a full stop.

 

Mine always sits at 600, although I have not really took note a lot. I will re-post if I notice a 500 occurance...