Yes, I had similar symptoms on my Hyundai, including rough idle and increased oil consumption. Replacing the valve cover membrane solved the problem almost immediately. I ordered a replacement from https://klifex.net/products/hyundai-kia-valve-cover-membrane-1-6l-2-5l-224102m800-224102m810 , and the quality was excellent with a perfect fit. If you're looking for a reliable and cost-effective solution, I'd definitely recommend checking out Klifex.