You do know we're having a massive solar storm right now and could be roasting your ECU.
J/K
Little bit of research on that code showed it can be related to the TB and happens when it's cold or first thing in the morning.
One guy (caddy) replaced the TB and all is well. Wonder if your 3 bolt TB is leaking when it's cold but expands and stops the leak after it warms up?
Just a thought.