cammed and tuned my ss bout a month back, sometimes after reving it,it idles back down but falls back down to like 500rpms almost like its gona cut out and them slowly comes back up. and wen it does this the car smokes a little and the car also smokes wen just idling normal why is this? and all the valve seals are new so i dont think its something of that nature

 

has your car been tuned after heads cam and do you have your own tuning equipment? sounds like a tuning issue...

 

chuck from hpe here in houston tuned it, and its just a cam only car

 

You have an auto? What size cam, and supporting mods?

 

probably needs a good idle airflow tune along with a better tune in general, unless its an absolutely huge cam....