Replaced Intake Manifold Gaskets/OSV/Valley Pan a few weeks ago.

Now I get stupid white smoke with a coolant smell every so often.

And the car has burned over 2 qrts., whereas before it would never burn no oil.

I also started seeing SES with the code P0150, Driver side Pre-Cat O2 sensor. The O2 sensors were replaced a few months ago.

I think the white smoke has to do with the diafram in the back of the mainfold.

The car runs like a champ overwise.

Any other ideas on why my car is being werid?