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P1394 Audi - random misfires

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Misfires intermittently. Can be on startup or after 5 mins. If driving on while misfiring engine clears and runs perfectly after 10 to 20 minutes. Owned since new and Audi serviced all life now 180k.
B6 2.4 A4. Replaced coil pack, leads and spark plugs 5mths ago and engine has been perfect up to now. Recent VAG codes show P1394, P0300, P0302, P0304, P0306.
New battery fitted. Cannot detect any air leaks. Tempted now to replace coil pack again. Any other ideas?

Vehicle: 2002

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