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Sounds like the fuel system is losing pressure. I'd get the fuel pump tested ASAP. If that checks out fine, and you don't have any noticeable leaks, it's probably bad injectors. The reason it revs higher when you push the clutch is that, when it's idling in neutral, it's still turning the internals of the transmission. One of my friends noticed that his revs drop about 80-100 when he turns the rear defrost on because of the extra drain on the electrical system. I notice the same (although no tach) when I push all 4 window switches at once.
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