I would have to agree with vande97, except for the fact it runs good when cold. If it was a fuel injector problem, it would run worse when cold.
It does sound a lot like my friend's bad injector experience, but also a lot like a BAP sensor problem too. Problem is, it's active in open loop.
I'll keep my head working on this one, also, a fuel pump would have a tendancy to show up after running for a while, and on a rev you'll never get the fuel useage as you will under power. It could still be a fuel pump even showing good pressure. If they are getting weak, the problem will show up after running for a while usually.
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