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Just guessing...

I'm sure it's not a water not being there issue. That is telling you that you are running way lean there of course, so I like to think it might be the water temp sensor getting too much flow and leaning your engine out thinking its running too cold. Weird part is that the two last cyls would run lean and not the engine as a whole, but maybe you could chalk that up to the fact that at normal conditions those run lean anyway, just not lean enough to glow and are now noticeable due to an increased lean condition overall. Also check the injector harness, maybe the connectors are not firing them. But like you said this is at operating temp only so maybe...
Just plug it up, and read the codes is the best I could recommend.


Dan

Sounds like a beauty of an engine though...
 
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