Join Date: Jun 2008
Location: Richmond/Norfolk, VA
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Carbon Monoxide would only come from your exhaust and that would only come out into the cabin if your exhaust system had a leak or gasket problems shot it out the side of the head/valve cover or backwards out the intake.
I would take a peak at the head gasket (probably the only gasket you can't replace with a cutout from a manila folder, so buy a replacement gasket before removing the head) and valve cover gasket. Also, if you don't already have one, run an air intake hose back to some storage compartment not in the cabin rather than just leaving the littler perforated breather thing on.