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I'm trying to do a fuel injection and HEI distributor swap on a 4.2 on the cheap. I've had way too many issues with the stock ignition and Weber carb, just trying to run down the road. That's not gonna cut it when I go 4 wheeling. I'm wondering if anyone has swapped just the 4.0 intake manifold...

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...