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996 Valve Knock Ticking Sound

Engine

Vehicle Information: Year: 1999; Body Type: Coupe; Total Mileage: 16,000;

At a recent PCA car control clinic I participated in the wet skid pad session. After my first run I noticed significant ticking coming through my exhaust. It sounded like valve noise to me. The noise was loud enough for someone to mention that they thought I needed my valves adjusted. The noise quickly disappeared after the event. Should this be of concern to me? I should mention the engine oil was full and I had street tires on the car.Also, I notice my tach "jumps" quite a bit when driving at a steady speed, even with the cruise control set. I would guess the tach inconsistently jumps up to 250 rpm at a time. The engine runs smooth, so it's more of an annoyance than anything, though I'm not sure if this is a sign of bigger problems.

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