So when I bought the 97 S14 and sold the 99 SI one of the long term bennifet's I cited in my decision was that owning it wouldhelp me to learn more about working on cars. For those of you who don't know I was an aircraft mechanic for 6 years so mechanic repair isn't hard for me I just don't have allot of experience doing it with cars. Or rather I should say didn't lol. Since I bought it: Tie Rods Front Lower Ball Joints Front Cover Seal Alternator Waterpump I'm sure I left something out, but everytime the process is the same, I find someone who can tell me what's wrong, I buy the part, locate it under the hood, and change it no prob lol. Well here's he latest problem In the last 700 miles or so my fuel economy has sank from 22 all way way to 16MPG some useful info Spark plugs are plat and 2 years old Wires looked new when I bought the car two years ago vehicle runs smoothly I use 92 octane Fuel Filter is a year old There is obviously no leak, I'm not a dumb ass Any idea what's wrong?