I finally got home after my long business trip and adjusted the bowden cable to bring the shift rpms down. when the car is cold (not up to operating temp) I noticed once it seemed like the transmission was not engaged. could rev the motor but no car movement. Trans fluid was correct level and clean. Never had the problem occur all weekend until my wife drive the car today, same problem. Plan to change fluid and filter tonight. Will check modulator for vacuum leaks etc but is there anything else to look for? I do not have any "check engine light etc" so assuming no codes. Car has 140K miles. Seems like the "disconnect" issue is in the lower gears.

Appreciate any help or suggestions.