overheating and stumbling

Nissan370

well reason i was thinking stuck thermastat.
if the thermastat is stuck closed it blocks coolant from getting to the motor
that coolant becomes ineffective and the engine temps began to rise.
as i was driving for about 30min before i notice the car feeling funny.

and as soon as the engine temp gauge showed normal and sit there for a few the oil temp started dropping so.

the oil temp my have been alittle higher then that but when i started to look around it was sitting about 240

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370z vsr motorsports single turbo/built motor 9.1cr 525rwhp/450rwtq @ 10.5psi (stock maf maxed out)