Engine hard to start, when up runs ok, rough idling and stalls

Honda Accord 1992 2.2l.


The car worked flawlessly until yesterday when I came back from one
month vacation. The car started up with no problem at all. It ran for
another 5 kms or so. After I parked (in deep snow), shut off the
engine and another 30 minutes the troubles began.

Since then the car was difficult to start. When started up I had to
keep pressing gas pedal to keep it running. From 1500RMP up, the
engine didn't experience any troubles at all - responsive, full power,
no choking, all ok. Bellow 1500RPM it quickly got worse - the idling
was rough, unresponsive to the gas pedal and was hard to keep up.
After an hour of trying to start up the car it got to the point when
it wouldn't start at all.


Other observations

* No strange sounds when starting up, except - 2-3 dull sounds/clicks
during the ignition process (fuel lines, intake?)
* The car was sitting for 1 month with almost empty gas tank (clogged
fuel system?)
* The symptoms worsen quickly in half an hour