Not quite sure what you want an answer to.
As far as your intake gaskets leaking internally, that also gave you a vacuum leak on the affected cylinders, which would cause them to lean out, and run hotter.
For future reference, there's a pretty easy way to determine if you have an internal intake gasket leak:
Fully close the throttle plates
Disconnect and plug any vacuum hoses attached directly to the intake
Disconnect the coil
Attach a vacuum gauge, and crank the engine. A reading of between 3" and 7" of vacuum is normal. A defective gasket will, in most cases, yield a zero vacuum reading.
Take care
~Chris
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