The valves are adjusted by loosening a 10 mm jam nut and checking the clearance with a feeler gauge. A certain procedure must be followed. Just Google "denlors valve adjustment article" for detailed "how to" instructions for most 4cyl Honda engines.
The EGR valve for a Honda EX 1991 is at the top of the engine. It is at the front, just to the left of center.
valve lifters? it sho do
Try this http://tw200forum.com/index.php?/topic/361-adjusting-the-valve-clearance/
Intakes, Pipes,
The front spindle nut on a 1991 Honda Civic requires a 32mm axle nut socket.
134 ft-lbs
with my 1991 Honda civic @ approx 200,xxx miles and a 12 gallon fuel tank, i get 27.75 mpg driving at 70 mph. with an newer engine and proper engine timing and valve lash you could expect 32 mpg or better.
Could be your Idle air control valve.
all cars built after 1991 are required to have a emergancy fuel shutoff.
do 1991 honda accords have airbags?
Purchase a Haynes or Chilton's repair manual at any auto parts store. Here you will find all the valve and torque specs.