Replace fuel filter/has water
Sounds like the Oxygen Sensor could be faulty, or the fuel delivery system is going haywire for some reason (leaky or plugged injector on some cylinders).
The fuel delivery is controlled by the Oxygen sensor, though.
Good luck on this repair.
I had the exact same problem and after reading all of the advice on the internet (mostly saying "bad o2 sensor") and changing out every sensor imaginable, distributor cap, rotor, spark plugs, plug wires, air flow meter, fuel injectors and harness and every other "fix" I had read about, I took it to a mechanic. $1000 later and a new valve to replace the bent one and my 4runner runs like new. Which for the sluggish 3.0 isn't saying much anyway. Point being that I probably threw 1000 bucks worth of new parts on it before I actually took it in and got the problem taken care of. Save time and money and take it to a pro or pull the engine apart and check the valves yourself.
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