Im working on this at the moment and looking for the reasons, my ltft are at -17 at startup.

Simultaneously I search the p0300 p0307 problem, which suddenly has appears by driving and later at cold start.
Then its gone and all works fine.

No leak found yet and it makes no difference if driving on lpg or gasoline - log shows the same.
So I concentrate on electrical things like wiring or grounding from the lpg controller.

Never had such problems until we drove two Dodge….

Merry Christmas