Hi,
I have an 89 4x4. Recently I noticed some occasional hesitation at freeway speeds. Then it got progressively worse within 5 drives or so. It doesn't accelerate well and hesitates/bogs. I pulled the codes and got 2-1, 5-1, and 7-1.

I'm hoping to get some help ad to where I should start. Also if it matters, my van tends to run on the cold side for quite a while after starting and running.
Any suggestions on where to begin?
Thanks. This forum is great.