Fuel pressure regulator and or fuel filter. You may have a starvation problem. Tank pick-up filter if you have one may also be a problem at low rpms. If you can test your fuel pressure that would be a good starting point.

A low fuel condition could be causing a hot running engine. The same could be true if you have way too much ignition advance, but looking into fuel delivery first and if that is good check your timing to see if you are too far advanced.

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)