2002 2.3 Duratech

[Qmc08]

I am having some irritating problems with my truck. Its an 02 ranger 2.3 Liter. I have 122,000 miles on it and its a 5 speed. My problem is that in the mornings when i start it up it idles really wierd....like under 500 rpms until i give it gas then it revs up a little bit and acts normal. Sometimes it surges driving down the road between 30-40 mph and seems to be lacking alot of power. At stop lights its really sluggish upon take off. Does anyone have any ideas on what it could be? I would really appreciate it!! Qmc08