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I had a faulty lambda probe on my 33 before, it gave rough idling and transition to full throttle, also had a bad fuel press regulator, wich caused rich running (too much pressure) now if you don't have top end power it seems like you don't get enough fuel at those rpm's, might be a couple of things, low fuel press (faulty fuel press regulator, clogged fuel filter or bad fuel pump, the pump usually makes a lot of noise when it's about to go, it's behind the left rear wheel), or the other thing might be dirty fuel injectors.
As far as the probe goes, when you plug in the diagnostic computer (pretty much any fuel injection place has one) you should see the lambda value move around, that means it's correcting and therefore working.
Good luck!
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