lean code. now little to no acceleration with sputtering/ hesitation

Start with the basics first. Compression and fuel pressure are confirmed and good? No intake leaks at all? Resistance on MAF and MAP doesn't mean the sensing element actually working. Can you see live data through ECM? When you disconnect the MAF it works better? When you reset the ECM it works perfectly until code returns? What about O2 sensor readings? Can you check the wave form of it? Zee

Is the exhaust leak before the 02 sensor. If so, that would throw off the sensor readindg and cause a hesitation. If not,it could be many things, but most likely its either an intake gasket leak or an o2 sensor. Spray some carb cleaner on the intake gaskets while the engine is running. If there is a change in RPMs, you've got a leak. If not, its probably an o2 sensor because if it were anything else it would likely have bank 2 lean code or misfire codes. Be careful because some camrys w/ cali emissions have air/fuel sensors instead of o2 sensors. If that is the case, you should only use a Toyota part and replacing it w/o confirmation is an expensive guess. Let me know if you have any more questions.