[Gardd]

Based on what you said about cracked / broken / disconnected lines under the hood, I thought I'd take a look for myself today before bringing it into the shop this week.

Well...

After poking around under the hood for a minute I found that the large accordioned rubber duct leading from the air filter box had worked itself off from where it connects to the top of the engine. I wrestled with it for a few minutes (and I mean wrestle; with our cold winter temperatures right now the rubber was pretty darn stiff) and finally managed to get it back in place. Gave it a good tightening.

Then I started the car and let it idle for about ten minutes, and gave it a good rev now and then. Seems fine now! But after supper tonight I'll take it out for a good run just to be sure...