1994 Buick Century Needs Repair.

For Sale 1994 Buick Century.Real nice car that needs someone with more Automatic Transmission Knowledge than Me! This car was bought and driven for 2 days And then started falling into neutral going down the road as if you reached up and put it in neutral. It had one code PO705 Transmission range sensor circuit,range or performance problem.Replaced this switch,and had the transmission screen and fluid replaced.$300.00 and seen No change.I can't keep spending money guessing.
U tube says TCC switch or Pressure control solenoid is common problem With the T460E Transmission.I don't Know! Motor runs great, and the car drives real good when it is cold. As soon as it gets warm it falls in to neutral. Cutting my loses selling for about half of my investment.Would make someone a good car if repaired !
Local pick up, or I can deliver up to 500 miles @ 2.00 per mile one way. (pre-paid)
Thanks for looking!