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This may apply to your acceleration issue though this did not specifically target the model of your vehicle. There are models that end up with erroneously programmed chips ... yours may be one of them.
Copied and pasted from other posting:
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Go to the dealer, And have the TSB applied free of charge:
TRANSMISSION & CLUTCH
TC003-05
Title:
ECM CALIBRATION: SHIFT FEELING
ENHANCEMENT
Models:
'04 - '05 Camry (3MZ-FE, 5-Speed A/T)
June 3, 2005
Introduction
To improve the transmission shift feeling during specific operating modes, the Engine Control Module (SAE term: Powertrain Control Module/PCM) calibration has been revised. These improvements include:
^Reduced downshift lag when accelerating at speeds from 10 to 20 mph.
^Less gear hunting when driving on/off accelerator pedal at 20 to 30 mph (for example: during heavy rush-hour traffic).
^Improved response rate during heavy acceleration from a stop.
NOTE :
^Version 12.2a or later Diagnostic Tester software is required to perform this procedure.
^Before proceeding, verify the ECM (PCM) calibration has NOT been updated by checking for the Authorized Modifications Label (shown in step 1 of the Repair Procedure).
^Harsh ATM shifting may result if any Repair Procedure steps are omitted (specifically steps 2 and 4 of "Flash Reprogram ECM").
Applicable Vehicles
^2004 - 2005 model year Camry vehicles equipped with 3MZ-FE engine and 5-speed automatic transmission.
Warranty Information
Applicable Warranty*:
This repair is covered under the Toyota Federal Emissions Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle's in-service date.
*Warranty application is limited to correction of a problem based upon a customer's specific complaint.
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