You certainly got enough wrong answers and short answers. 1) The fellows that suggested too much fuel are most likely RIGHT. That is the primary reason for a catalytic converter to overheat. The catalyst is actually there to finish completing combustion of the fuel that the engine has not completed. If the engine is running too rich, it will overload the catalyst. 2) Whatever someone did to their Toyota or neon 5 years ago has NO RELEVANCE to your problem today. Too lean of a mixture will cause idling problems, but will NOT cause a catalyst to overheat. Vacuum leaks typically cause a lean mixture that will generally NOT overheat the catalyst. 3) As to cleaning the throttle body - CHECK with the service manual. Some throttle bodies are NOT to be cleaned. For example, Fords since 1991 have throttle bodies that will be damaged by cleaning, and have warning stickers on them about it.
Janicholson had the right answer as to where to start. Also look into a ruptured diaphragm in the fuel pressure regulator. It is a smatt device that looks like a small canister on the fuel rail with a vacuum line going to it. Check it by taking the vacuum line off and looking for wet fuel at that point. It should be DRY.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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