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The O2 will never cause over fueling as you call it. Have you run a fuel pressure test? Have you checked for fault codes? I would think that you may have a fuel pressure regulator that has a ruptured diaphragm. It is at the back of the fuel injector supply rail ands has a vacuum hose attached to it, pull the hose and see if fuel gushes out.
Do you have a check engine light on? First thing I would do is unplug the IAC motor when the engine is warm. If the idle speed doesn't change you have a vacuum leak or a bad IAC motor. If the idle speed goes down you might have a bad TPS or IAC
try checking the thermostat control senser. it caused my bronco to start for a second and then die. after a while it would finally start and run for a while then die driving down the road. i changed the thermostat control senser and it fixed all problems of dieing