Bad spark plug ignition coil's do that too. Cheaper. $50. #2 cylinder is the middle one on the rear bank which is closest to the firewall. You'll need to take off the top intake to get to it.
Intake manifold gasket. A leak at the intake's port for cylinder 2-between the intake and the cylinder head- would cause just such a lean condition at #2. Sounds like the gasket failed.
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