Weird transmission issue

Just got a 2010 G3 which I believe to be the same as the Aveo for my daughter.

Had it a couple of days, check engine light came on two days ago. P0014 which says B Camshaft position timing, and P0171 system too lean bank 1

yesterday, developed a weird transmission issue.

Suddenly while driving, it is as if the car was shifter into neutral. No go at all. You can can go through all the gears, to park, back through and it does not make a noise or a hint of movement.

Shut off engine, pull key, immediatley put key back and start and everything works normal for a minute or two, then same thing, acts like its shifter into neutral on its own.

I am new to these cars, and this forum. Any help would be much appreciated