pmondo

Here is what I have. For a couple months I have been turning the key on, before start, and waiting for a couple seconds before I start it. If I don't do this it will take a few cranks before it starts an runs rough for a bit.
Today, I decided to cover half the radiator with card board. Because previous owner said he put a 180 stat in there and it does fine in the summer but winter there's not much heat. So that's why I figured to try the card board. After this, I drove to town and back which was maybe 45 mins. On the way back, just about home, it started "motorboating" going up an incline and ran rough till I got home. I let it set for a couple hours and tried driving it again. It ran fine till it got to around 200-210, then started its **** again.
From a few searches I gathered maybe fuel pump, O2's? Some of the scenarios didn't really match mine that's why I'm posting.

Any ideas? Thanks in advance!