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Just as an update I got it out of limp/fail safe mode. I ran through every sensor except the knock sensor checking ground, sensor signal etc. Everything checked out. Went and started the car and it started fine. It was idling fine with a slight misfire occasionally so I went to pull the codes and there were none. Took it for a slight drive and it was running on the rich side. After driving around for a couple of minutes, I parked the car and it fell on its face in the parking lot and died. It had switched back to limp/fail safe mode which I verified by checking the ecu light constantly lit. I am straight up stumped.
As a side note when the car was completely cooled off, there was quite a bit of pressure under the radiator cap...weird.
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