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This question also edited for clarity and spelling 'Colbalt' to 'Cobalt'.
Question also moved from Misc to model category. There are 10,000 to choose from listed by 'make year model'.
I would recommend cleaning the throttle body with carburetor cleaner, remove the air inlet to the throttle body and try cleaning. After cleaning will be hard to start but should solve your issue
Your Po449 code means: Evaporative Emission (EVAP) Vent Solenoid Control Circuit. Check to see if anything on you EVAP system has gotten disconnected and make sure that none of your hoses have gotten old and bridle or have holes. If everything looks ok, you probably have to replaced the Vent Solenoid Valve, which is located on the EVAP canister.
You have a leak. Check the oil to see if there is water in it. Withe the engine running, check the tailpipe to see if excess water is coming out. If yes to either of these, then you have a bad head gasket or cracks in the head/block. You need to find where the coolant is leaking in order to fix it.
What code?
what code keeps coming up?
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