The green stuff (verdigris) comes from water left in the carb. Water could be from condensation, or from ethanol in the gas. (The ethanol in regular gas and E85 will always have a bit of water, and depending on how the fuel is stored it could pick up a lot of water.)
There are a lot of things that can cause dieseling. Make sure the idle mixture screw is working (which means the idle circuit is OK). It may be that the idle stop has to be screwed way in to make up for a plugged idle circuit.
Make sure all four cylinders are hitting by pulling the plug wires one at a time. These engines run very smooth, and you can have one or even two missing cylinders and it will sound like it's running fine.
If everything seems to check out, it may have carbon deposits in the combusion chambers. I've had some success with using snake oil gas treatments that supposedly remove carbon deposits. I'm not sure if they really work or if it's in my head, though.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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