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do not drive the car like that. Running excessively rich is not good for an engine.
It sounds like you need to run it on another computer to verify that is the problem, why not buy/barrow one from the shop that has the spare they tried? did their computer make the same noise? I've never heard an ECU make noise before. Did you look at the little knob to make sure its not turned (with a screwdriver you can turn the CEL knob on the ECU)
this is how your engine is fueled:
maf voltage -> ecu -> injector on-time
As you can see, there is little to it (maf voltage & ECU). Given that your problem is intermittent, that pseudo rules out injector O-rings, but not so much a sticking regulator (fuel pressure may rise to 100+psi if that is a good pump), things of that nature. It does point to a "boost" leak, but one that large should not be intermittent (unless it is the BOV related which I mentioned) which comes back to maf voltage related (notice how boost leak leads to maf voltage related).
after considering what I said about the O-rings and regulator, that only leaves the maf voltage, and ECU, with a "maf voltage problem" being the less likely of the two.
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