1997 honda civic ex -gas mileage

my gas mileage has dropped 40% in the last 2 weeks. When i drive the
car and press the gas sometimes it doesnt respond, it acts as though
the gas has finished and then suddenly revs up.

any ideas what i need?

oxygen sensor, fuel filter causing the mileage to drop so much?

thanks

PS I changed the plugs, wires

 

Check everything at
http://home.earthlink.net/~honda.lioness/id11.html

 

thanks

i tried looking but could not locate the pcv valve. i see a tube runing
from air filter housing to engine block but when i open the 2 clips
closer to the air cleaner i see no pcv valve simply a rubber connector
tube

could it be missing a pcv valve altogether or maybe im looking wrong
place?/

 

thanks

i tried looking but could not locate the pcv valve. i see a tube runing
from air filter housing to engine block but when i open the 2 clips
closer to the air cleaner i see no pcv valve simply a rubber connector
tube

could it be missing a pcv valve altogether or maybe im looking wrong
place?/

 

Here are some illustrations of the PCV valve's location that
might help:

http://www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&catcgry1=Civic&catcgry2=1997&catcgry3=4DR+EX&catcgry4=KA5MT&catcgry5=BREATHER+CHAMBER+%282%29
(part #3)

http://media.honda.co.uk/car/owner/media/manuals/CivicManual/pdf/11-3.pdf
(page 3, center of top drawing)

http://media.honda.co.uk/car/owner/media/manuals/CivicManual/pdf/11-109.pdf
(right hand side drawing, top)

 

thanks a lot