I've just recently bought a '96 Accord DX non-VTEC and the idle was rough and the gas mileage is really bad (barely 350 miles on 15 gallons~23 mpg). When I changed the spark plugs the number 2 plug had oil on the outside of it. I read on here where the spark plug tubes leak sometimes but I read where someone said the upper was all you needed to fix, but someone else said there were other things you had to replace, so I'm kinda confused. Anyone else personally had this problem fixed and maybe have an idea about gas mileage being that poor? ANY help would be SO appreciated, and thanks guys...