GMC C1500 Engine Revs Up

I Have A 2002 Gmc Sierra 1500. The Engine (especially In The Morning) Revs And Comes Back Down, Revs, And Comes Back Down.. Etc... While...

Truck Is Manual, When I Was Driving And Came To A Stop The Rpm Would Stay Up When I Took It Out Of Whatever Gear It Was In And If I Put It...

I Have A 98 Chevy Truck 1500 4.3 5sp 176000 When I Come To A Stop My Rpm's Won't Kick Down, It Tacks At 2 Or More Even When I'm Driving...