i would probably say limg as well... would it be possible that the gasket is bad enough to cause a vacuum leak there? that would also account for the hiss. how many miles are on your engine? and ^ what he said about all the oil checks, that will tell the story.
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3rd alero- 02 GX 2.2 5sp coupe. drove for 3 years 55,000 miles. Sold for a kids first car, and missed
01 Intrigue GX
2016 Chevy SS, Jet Black
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