[chrisk03]

I've gotten this surge before. Almost always happens when starting the car and the AC is on. The first video you posted it seemed like that car also had their AC on (full blast) and that's when it started to surge. My guess is there's something in the ECU compensating for the compressor kicking on/off and it doesn't quite know how to modulate properly. If I rev the engine slightly for a few seconds, it seems to go away.

Could also be the fuel, but I pretty much use Shell religiously and am at about 17k miles. Never used the techron formula, but probably should throw a can full in to see if does anything. Can't remember if this happened before they installed the PPK, as well, or just after.