Originally Posted by wind.zero

^^
This

Find out if you have a code that is not throwing the CEL. I had this and it was a small adjustment in my tune but your description is almost exactly what was happening to me. It was definitely limp mode. A restart of the car, or several restarts, usually fixed it.

My problem tracked backed to a MAP issue in the tune. Did you wash or detail the engine recently? The paste below was the troubleshooting path I followed:

It is probably worth a shot to the check the MAP sensors:
1) Harness or connectors
2) Mass air flow sensor
3) MAP sensor
4) Evap pressure sensor
5) Intake air leaks
6) Intake air temperature sensor

Good luck. Limp mode sucks.