Please heed this one sentence.
The ECM and related electronics CAN NOT IN ANY WAY SHAPE, FORM or stretch of the imagination cause the issue you describe. No way, no how.
The O2 sensor will have no effect on this, because it likely won't even be warm enough to go into closed loop in under a minute, from a cold start. If it does go into closed loop it would only be a short period of time before the engine stalls.
An injector could be held open by debris lodged in the pintle, so no, it doesn't have to be the PCM.
Limp mode is a temporary thing, and only happens when multiple sensors fail, or there is an internal problem in the PCM, but even if the PCM was in LHM, it would not, could not cause the situation you describe.
A vacuum leak from a damaged injector O-ring could not cause the situation you describe. Yes, it would cause a lower vacuum signal, though not usually enough to cause substantial changes in vacuum that would cause this much fuel to be injected, which physically can not happen with properly functioning injectors. A low vacuum will cause the PCM to think that the engine is under more load than it is, and inject more fuel, but it won't re-route the fuel to the throttle body area.
Knock sensor only effects spark timing, at least in the slightly older ECMs, but I would suspect yours to be the same.
Oil pressure sensor only control fuel pump relay and the gauge or light in the gauge cluster.
Coolant sensor can effect fueling, but again, not by the amount or cause the situation you describe.
Does it back fire at all?
The only thing that has come to mind is if there is such a blockage in the exhaust system that the only way for the exhaust to go is back up the intake, which could very well cause the fuel to be forced back up the intake runners. After that happens the throttle body area is lower than the plenum, so the fuel would flow down to there. It would only run for a short period of time as well.
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