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What would make a 1994 Toyota 22 re engine to run rough when you take the oil cap off?

- Clogged PCV valve: The PCV valve is a small valve that helps to regulate pressure in the engine. When it is clogged, it can cause the engine to run rough and stall.

- Damaged piston rings: Piston rings help to seal the combustion chamber and prevent air and fuel from leaking out. When they are damaged, they can cause the engine to run rough and lose power.

- Worn valve guides: Valve guides help to guide the valves as they open and close. When they are worn, they can cause the valves to leak, which can lead to a rough idle and loss of power.

- Vacuum leak: A vacuum leak can also cause the engine to run rough. Vacuum leaks can be caused by a variety of things, such as a cracked hose or a loose connection.

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