fuel injected throttle body

Newly purchased 1990 YJ 4.2 with a Weber carb. The issue(s): Everything was fine when I did the test drive before buying it. On the way home the temp gauge slowly crept up all the way to just under the red mark and stayed there. When it got hot, it started sputtering and bucking like a bronco...

Ive got an 1989 new to me YJ, has trouble starting sometimes, runs fine once it starts and doesn’t always give me starting problems. I want to clean up the TB to see if it helps but I need to order a gasket to reassemble. My intake looks to be fuel injected and shows an “XJ” stamp in the intake...