a mates car did something similar , , but it was intermittent sometimes it would go ok for a couple of weeks then out of the blue it would just play up when hot, it turned out to have a dual problem , one was a bad earth and the other was a blocked catalytic convertor which would run ok while cold but would block up when hot only for some reason, after replaceing everything that could be replaced over a 2 year period trying to find the problem(except for the cat) , some many times over the main culprit was the cat, not saying this is your problem at all, but if all else is tryed and tested ok, its 1 more option to check.
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