One of the old ones. The one currently in there has a metal pushrod, whereas all of the OEM pics I'm finding are plastic; so I'm wondering if it's just a poor aftermarket unit, and am probably going to just buck up, swap it and hope that's that. The spring looks g2g as best I can tell. I'd think that if that was the problem, the symptoms would be consistent and repeatable. As it currently is, the issue is intermittent and I can't intentionally force it to replicate (I can't ever get it to happen with the car static and off, for example, which I've tried to do so I can more easily hop out and try to look at what the slave is doing when it presents). It just does it when the temps are cold enough and it feels like it.