Oops, sorry. The 94 Sensors seem to be far less for any Civic that is not a VX.
Still, this price beats www.hondaautomotiveparts.com , at $340 + s/h.
If after performing a tuneup (new plugs, possibly new ignition wires, new distributor cap and rotor, new air filter, new fuel filter, check timing), the stumbling and/or poor gas mileage continues, I would consider a new O2 sensor.
Yes it does. The usual rightie-tightie lefty-loosy threads.
IIRC sometimes it's very tight. I have used a pair of pliers on its end to get a good grip.
Might be a good idea to buy a spare from your dealer in advance in case it does break. Though I haven't heard of one breaking.
Leave the passenger car fan off.
I would perform (and do perform) the bleed with the cap completely off. I too noticed a similar discrepancy between what's in my Chilton's manual and what's in my owner's manual for this procedure. I see the service manuals at the site below say to leave the cap completely off for the CRX. (I think the Concerto manual has a typ-o on this point.)
It makes more sense to me to have the system under the lowest pressure possible so as to encourage air to escape it.
Try the Concerto manual at http://www.honda.co.uk/car/owner/workshop.html , under "Fuel and Emissions" then under "Idle control system," for other things to check, especially the Electronic Air Control Valve. This group gets a few reports of this failing every year (assuming the air purge above doesn't fix the problem).
Can you clarify: Is the car both stumbling while accelerating and has an erratic idle?