I am going to check the valves this evening. So you're saying there's probably an issue with the new valve cover, correct?Had this issue reported by a few people. Obstruction/blockage in the valve cover. One of them was on a brand new OEM valve cover. Told him to replace it. He did and problem went away. It's not common but it happens.
You should also inspect the check valves. When all of these components work well, the car runs well.
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