High idle/rough idle

Hey guys, anybody have answers about idle rpm's for 3rd gen?
When it's below 45 deg I cant get engine to idle below 1100 rpm until I've driven a few miles. Even after letting it warm up for 20 min. Then when its finally idling normal after driving (800 rpm) if I shut it off for 10 min and restart it, it's back to 1100 rpm.
Is this due to the catalytic converter temp sensor? Creates a hard shift when putting it in drive most times.
Also experiencing occasional rough idle when stopped in gear and funky shifting when going from park to drive.
Almost 8000 miles on truck, but this is first cold weather experience with it.
Any wisdom or informed opinions appreciated. Thanks!

 

I dont know the reasons as to why, but have definitely noticed that rpms run high on these 3rd gens.

 

Probably not so much of an issue with the m/t though

 

Ya not really. Just always thought that 6th gear at freeway speeds should come in more like 1800 RPMs for better mpgs