Strange idle problem with GTM SC Stage 1

wind.zero

The erratic idle is independent of the AC. It happens with the AC on or off. It was off during the video.

Thanks for the responses. I am waiting to hear back from Sam and Kenny, but I am leaning towards changing the plugs and trying the ECU learning.

If you watch the video close from start to finish, you see the idle bounce around 50-75 maybe 100 RPM. It feels like a slight knock which I hope are the spark plugs. Then at around 40-43 seconds in the video when it dramatically dips, the car shudders and usually the idle shoots to 750 and stays there. It is really odd but it happens at least once everyday. It is hard to reproduce though. I cannot make it do it.

Bullitt
Mine has never completely died. It comes close and only at idle for 30-40 seconds like at a stop light. It does not happen when rolling luckily.

weiboy718
Do you know the part number for the HKS plugs?