'98 Land Cruiser 100 Series Will Not Idle

[NiteCruiser]

Hello all, new here and need some help with my Land cruiser. It is a '98 with the 4.7L V8 engine. Well the Cruiser has 280k miles, runs and drives great. Regular maintenance done and no major past issues. The problem, it just won't idle on its own once it's warmed up. First cold start it will idle ok, it will stumble slightly but catches and idles good. Once it's been ran and shut down, it will start but requires some input from the throttle pedal to stay running. I have been using my other car since the problem came up. I finally decided to fix the Cruiser. I had codes for o2 sensor and coil pack. I replaced those along with new spark plugs. I cleared the codes. That all helped but still no idle. The only code I'm getting now is P0710. That indicates the wrong value for the transmission temp. I don't see how this is related. Please some help or suggetions would be appreciated. Thank you very much!