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