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right, I doubt its your fuel system. Just something to throw in the mix. If we rule that out, then we must consider electronics, wiring, timing, misfires, air/compression leaks.
The engine stumbles as in, misfires? If the engine mis-fires your wideband goes full lean. That sounds more like an ignition problem, coil packs, grounds, plug(s). Could even be just one single plug mis-firing.
Other than that- a mechanical problem, such as a sticking valve, can cause a stumble/misfire. Something else to keep in your mind. Any funny "metallic sounds" when turning the engine over?
If you havn't changed the plugs... do that.
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