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I believe the issue with ether on a gas engine is in regards to it being a modern version with some sort of multiport fuel injection. Same issue on diesels. The air intake on these only carries air, not an air and fuel mixture like an older carb or TBI mixture, with the injectors squirting fuel into the cylinders only at very specific intervals. When you spray ether into the air intake it basically injects a flammable mixture into the cylinders whenever the intake valves are open and cause issues like pre-detonation.
The other potential issue on diesels is the glow plugs or grid heaters igniting the ether, which can really cause issues. I have used ether several times on my diesel but always manually disconnect the power feed to the glow plugs to make sure they don't come on.
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