I have had this problem before and flushing and refilling the tranny seemed to "fix" it. Now it's back and I need to invest in the repair.
Everything I've read indicates that it's *probably* the Torque Converter Clutch Solenoid.
My question really is the nature of the part. I have found this solenoid on Autozone and it's pretty cheap. But I have been told that these solenoids are in a package or kit that is not user-serviceable and is replaced as a unit, rather than a single solenoid.
Any helpful information will be much appreciated!