Originally Posted by Baby Lee
First and foremost, does it continue idling as if the key were still in the on position, or does it slowly chuff itself to sleep? If it's the former, your ignition module, specifically the kill switch, may have a short or disconnect.
If it's the latter, yeah, either pre-ignition or dieseling. The former [pre-ignition] concerns your timing or distributor points. The latter [dieseling] concerns either spark plug gap, or a buildup in the combustion chamber that heats up and acts as a diesel 'glow plug,' igniting the fuel through heat instead of electrical arc.
After the post run-on ignition off, and a period of cooling, is it difficult to start cold? If so that would be the strongest suggestion that your spark plugs are incorrectly gapped for the particular engine.
Depending on funds, I'd start with plugs by either [cheaply] taking the the ignition end to the wire wheel [mind the ceramic] and then gap them to specs, or [$baller$] new spec-ed plugs and wires.
In conjunction with, or immediately following, step one check out the vacuum connections. It could be that your vacuum advance is sticking open.
If that does nothing, track down a repair [not owners] manual and check the specs on the distributor.
Failing that, then you might have to pull the head and clean up the chambers. Don't know how pricey that is for a motor of that size/application, but expect at least a new head gasket, and at least use if not outright purchase of a torque wrench to re-install the head to the block within specs.
If you can easily track down a repair manual, or even better a specialized EZGO enthusiast forum, you may come across some solutions/communal wisdom that saves you a lot of trouble in the long run.
If none of this helps, the more specifics you can provide, the more help can be offered. This includes both model info [motor size, type, year, manufacturer, etc.] and symptom info [power lag, difficult starts, battery buildup, charging problems, fluid leakage, etc.]
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