I wood appreciate any help.

Have had several problems come up at once.
First came the transmission felt it was slipping from starting at a complete stop.
Then it seems to be starting of in a high gear and engine revving hard to go up slight climb.
Yesterday after parking it started up in park but no power when pushing on gas, only spudded.
Shut it off and will turn over but now start.

New here any help appreciated

 

Welcome to CL as a new poster.

Although it can also be discussed here, we have specialized CL forums of questions like this:

https://www.clublexus.com/forums/ls400-183/

https://www.clublexus.com/forums/maintenance-11/

Right offhand, though, it sounds like either a fluid/hydraulic pressure problem with the valves inside the transmission, or possibly a problem with the transmissions's ECU (electronic control unit).

 

Not sure if its a problem in the 2nd gens but what you are saying sounds like the ECU deal. Strange engine and transmission problems all at once. Check into the how to check for bad caps in the ecu.