Hi,
My bro and sister in law have had lots of trouble with their corolla.
Its a 4 door front wheel drive automatic with 180K miles.  Its the DX
model and has the 1.8L 4 cylinder engine.  It was missing and
backfiring really bad and kept stalling.   I bought some new NGK spark
plugs and had to gap them myself, I dont remember what the gap was,
maybe .32?  Kragen gave me the spec.  I helped him change them out,
the old plugs were awful.  The wires were old and not giving that
great voltage.  So we changed the wires the next weekend.  No more
stalling, no more missing, no more backfiring...  The dis cap looked
pretty good, no visable signs of wear.  The air filter is brand new.
I dont remember when the Oil was changed.  Well they are still having
a little bit of trouble.  It idles ok, but every 15 seconds or there
about at idle it will shutter really bad and almost die, occasionally
it will stall.  I am thinking this is an Air intake problem.  Sorry I
dont know much bout these cars.  Personally I drive a 74GTO and hate
new cars... a carb is easier to fix...  What could the trouble be?  I
looked at the air inake and everything looks OK...