97 4cyl camry with a140E auto trans, car shifts find until time to go into overdrive and it doesn't want to shift into OD without letting up on the gas a little....this is NOT at full throttle but with normal driving. any ideas????? which solenoid and location controls this. please note that button on shifter IS in the overdrive mode. thanks.

 

How many miles on the car? How often do you flush the fluid? Have you reset the CPU?