1997 Camry Vienta 3.0 litre revs high at startup

Sounds like piston blow by, as the gap increases and diesels have such high compression. When the turbo kicks in, the pressure is restored.

https://www.google.com/search?q=Toyota+Corolla+2+Litre+diesel.+Why+loss+of+power+at+low+revs+when+warm

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Your automatic choke is in need of adjustment.

Should be about 2200 when cold and 900 when warmed up. It is not stepping down properly. EZ fix.

MDS

1100 to 1300 is normal on a cold start. May want to see if a vacuum leak has developed or if the throttle plate is sticking open when it is cold.

It needs total tune up on engine fuel system and ecu engine to injectors must be check with scanning tools.

Temperature sensor

get car tuned up may need spark plug lead(may not be running properly on 4 cyls)may cost $80-$200 depends on parts needed

If your car is fuel injection,try changing the cold start temp sender.

You will need to have it towed to the dealer.

Sounds pretty normal to me.

There is a vacuum leak somewhere in the intake system. A very common problem on these cars is a PCV valve that gets stuck open and replacing that first is very cheap. If that doesn't solve the problem, then you'll have to go hunting. Listening very carefully for a hissing sound in the engine compartment will often lead you to a hose that is off or a gasket that has failed. You can also spray small amounts of aerosol carb cleaner at suspect areas to confirm the leak. The engine will change revs when fed the carb cleaner.