I believe the previous owner had the plugs replaced (meaning, they're about 2 years old and < 12k miles). I'm not certain about their life, but it very well could be that one or more needs replacing because it's not functioning up to spec. If I continue to have issue with slight stumbling when the weather gets colder, I'll definitely replace them all. They are a bit of a pain to get to, but I need to take my intake off anyways (it appears to be leaking goo from the interface at the cylinder head).
The car starts...probably 95-97% of the time (I've only had the problem 2x in the last couple weeks, and it's a recent development). From the not starting symptoms (cranking without any response from the engine), it feels exactly the same as if I were to stick the key in and immediate crank a cold engine over.
It simply seems too uncanny for all the glow plugs to simply start working or stop working at random.
Thanks for the input
