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Step 18 - Each intake and exhaust valve utilizes a spring which will return the valve to its original position (closed). If a valve spring has broken or a cam lobe has worn down, it will cause the engine to misfire and run rough due to the loss of compression.
An engine needs three things to run: fuel, air, and spark. If it's shaking, it's likely that the sparks are not happening or happening at the wrong time or intermittently. I think it's less likely that a stutter in combustion pulses is caused by air or fuel problem.