Toyota Repair: code Po303, camry xle, exxon mobile

Question
Hi, I have 2001 Camry XLE with V6 at 104K miles. The check engine light is coming on and off. First time Toyota servicing center told me that the code in in conclusive and they told me to try different gasoline(Exxon mobile) to se if the gas issue. Again check engine light on and this time it is constant. After checking the technician told me that code is PO303.The description is " 100000 tech found code PO303 misfire, needs all 3 fuel injectors". Also in the estimation mentioned like "fuel injector replacement:3 Bank 1 injectors $712.64". This diagnose happend on 7/7/10. I have been driving the car and the engine light is flickering and not picking up.More over while standing at singal light or in the parking the engine is hesitating and just vibrating back and forth littlebit. Please advise me how to proceed.

Answer
DTC P0303 is a single cylinder misfire that can be caused by a faulty ignition coil pack, toyota has even issued a service bulletin for this, why don't they try switching the #3 coil with another one and see if the misfire then goes to the other cylinder, if so then the coil is the problem.