Honda: 92 Honda Civic VX h/b, honda civic vx, air control valve

Question
I have '92 Civic VX h/b 1.5 manual(engine D15Z1) 174K miles
I'm having an idle problem. Will run fine, then idle REAL low, almost stalling. The Check Engine lite comes on...i've coded it, i'm getting 9 & 48. called dealer code 9 isn't a free standing sensor, its a component IN the distributor.  This distributor was replaced about 2.5yrs ago. Can I , should I try replacing the rotor in the dist. to see if that helps??  Could it be a clogged fuel filter?

also...does My engine have an idle adjust screw? and if so, where is it? I'm a mechanically challenged female. Any help (in ENGLISH, not engine-ese) would be greatly appreciated.

I'm also getting really HORRIBLE mpgs....like 30mpg avg on tank, and I do 75% hwy driving. My '94 DX h/b 1.5 manual w/ 212K miles gets about 36-41 mpg on avg per tank...and is what i'm using as 'comparison' for mpgs vs. the '92.


Answer
You may need to clean the idle air control valve, its located ine the throttle body .Clean it with throttle body cleaner just follow the directions on the can.The sensor may not be producing a good signal at such a low idle speed.(just a theory) I have had the same code on the civic from time to time and sometimes distributor gets contaminated with oil and cleaning it with some wd 40 or compressed air will help.