Also: how does it run if you throttle up to a high RPM with a cold engine?
If it’s temperature-related, coil would be more suspect. If it’s RPM-related, an exhaust blockage (or bad timing or worn cap/rotor or old condenser or sticking advance weights) might be more likely implicated. I would not tend to blame the plug gap for this symptom - the A4 is not all that sensitive to gap width.
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