Check for oil on the spark plug in cylinder #2. If there's oil, then you most likely need to replace the plug tube o-ring that sit between the rocker assembly and the head. They create a seal between the head and the rocker assembly where they meet at the spark plug tubes.
If you replace the plugs,the ones that were made for your vehicle. And possibly spark plug wires, it should make quite a difference. Good-Day! It could be a injector making its rough idle on cylinder 2, But do above first!
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