There's a small oil filter that gets blocked up. It needs a clean. Sorry I can't be more specific but that's what my mechanic indicated when this was happening to my '91 cavalier.
As Above, I remember a filter getting blocked in the air filter unit, But:
Given the age of Cavalier's these day, it's also quite possible that the engine is just "worn out". IE the bores in the block and the rings on the pistons have worn past the point they were designed to, and now combustion gasses are getting into the crank-case, and over pressurising it, causing the problem you have.
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