top pic of all data
bottom of start after sitting for a while
I think the jump in mat temp while off maybe a fuel droplet igniting on a hot surface possibly?
An active pressure sensor would help verify that while the car is off.
Seems like it takes around 19 minutes to fully heatsoak the intake manifold before leveling off from shutdown.
For the most part MAT is stable, but seems after letting the throttle shut has the mat temp rise, and it gets worse if the load was in a higher state. I'm thinking more and more this is cause of the in cylinder air rushing into the manifold because of the pressure difference like stated eariler.