Toyota Repair: hesitation, coolant temp, vacuum leak

Question
I'm a tech for over 25 yrs and this 01 corolla hesitates or stalls just of idle. Comp scan gives me P0172 CODE, put new o2 sensor,fuelpump,maf sensor,coolant temp sensor,cleaned throttle body,new pcv. Checked for TSB's with no luck. Can you help with any other possibility's.

Answer
Are you sure it doesn't have a vacuum leak on the intake side or possibly an exhaust leak, both conditions could make the O2 sensors give a false reading to the computer and drive it into a rich condition to make up for the lean reading. Are both O2 sensor waveforms normal? The only other thing that comes to my mind may be that one of the injectors may be leaking, the last thing to suspect may be the ECM, try checking all the ground connections to body ground for the ECM. Remove the connectors on the ECM and check for any kind of corrosion on the pins. If you need a wiring diagram I can send one but will need an email to mail it to.