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

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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?/
thx Elle wrote:

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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 97&catcgry3MR+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)

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thanks a lot Elle wrote:

http://www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&catcgry1=Civic&catcgry2 97&catcgry3MR+EX&catcgry4=KA5MT&catcgry5=BREATHER+CHAMBER+%282%29
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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?/
thx Elle wrote:

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