2002 Focus SE
Engine light on. Determined that gas cap was loose, as per owners
manual, for an undetermined amount of time. There was some rain and
high humidity. Had about 1/4 tank of gas left from a single filling.
The car seems to be labored at idle (stalled once), but runs fine as
soon as you press down on the accelerator. I can also hear, what I can
only describe as, a "gurgling" noise from the exhaust. The engine light
is persistent (hasn't gone off in three days), but the condition is
Filled the tank with high octane gasoline and a fuel treatment
(dry-gas). Burned about 1/4 tank, but the condition is recurring.