Hi -- hoping someone might be able to help me solve a problem.

My 1991 Dodge Dynasty (6-cylinder, 3 liter) was running more or less OK,
and then I went out one day and started it, only to have it stall after
the engine had run for about two seconds.  It does this repeatedly --
starts, runs for about two seconds, and then stalls.

I can kind of keep it running, I found, if I repeatedly press and
release the gas pedal very quickly (as quickly as I can) once it's
started, but it runs incredibly rough while I do that.  Then, when I
stop doing it, it stalls, even if it's warmed up a bit by then.

Any opinions as to what's wrong appreciated.  Nothing else has changed
with the car lately.  I did have a look at the air filter, but that
looks OK.

Jacques