Car: 1990 Beretta 3.1/AT.  240,000km.
Is now my designated winter commuter.
Runs fine.
Well, was running fine, now mostly runs fine.

The last couple of days at idle it's been running on and off rough like
a vacuum leak or plug wire or something like that.  At light throttle
openings it also "bogs" and surges like a badly adjusted carb would.
Stab the throttle, and it goes as good as a 17 year old V6 can.  No
check engine light, and nothing obviously disconnected under the hood.
(a couple of months ago the vacuum line by the TB popped out and gave a
2000rpm idle...)

Suggestions on what to check first?  I was thinking maybe I just got a
tank of bad gas - I did run it almost empty last time.  Also, about
three weeks ago the battery went dead because I left the interior light
on overnight - but if that was going to give me any issues while the
computer did a relearn, wouldn't that have been two weeks ago?

FWIW, virtually all the emissions stuff is ORIGINAL except plugs, wires
and filters.  Original fuel injectors, all sensors are original except
the 02 sensor.  Heck, I don't even know if this thing has a MAP or a MAF
or an IAC or what... never had to touch it.

And of course, this morning it drove to work just fine.
Maybe I just had to blow the carbon off the plugs?  :)

Ray