These are pretty common faults... usually due to a leak in the vacuum system. First however I would make sure your secondary air pump is turning on and is functional. If that's good you're going to need a vacuum tester to see whats leaking. The early cars have a vacuum operated change over valve on the hose from the air pump to the head that would fail a lot but they got rid of that I think by MY02. You'll want to check the vacuum reservoir and if its a tip check the vacuum operated coolant valve on the transmission. Both are pretty much known to fail and leaks there will cause the faults you have.
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