2009 Chevrolet Cobalt Q&A

2009 Chevrolet Cobalt Question: My car is using about a qt of oil every 400 miles but not smoking.

The car is using oil but not smoking. I use it as a commuter and put about 800mi a week on it. There is oil in the air plenum where it connects to the valve cover. it stalls sometimes when I stop but runs fine on the highway. Still gets good mileage. The engine light is on but the codes say a vacuum error. I have checked all the hoses, and everything is tight What could this be? -
Answer 1
What are the trouble code/codes mumber. When is last time you changed the PCV valve? -
Comment 1
It has some new codes from 2 weeks ago when I took them last. P0014, P0068,p0101, P0102, P0106. I am cleaning out the hose and plenum, it doesn't have a regular PCV valve to change its built into the valve cover.Also, changing the spark plugs today -
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The car is using oil but not smoking. I use it as a commuter and put about 800mi a week on it. There is oil in the air plenum where it connects to the valve cover. it stalls sometimes when I stop b...