Throttle Body problem?

[GasSavers_Ryland]

Check your throttle possition sensor for a dead spot in it's rotation, if it's good then I highly suspect that it's your O2 sensor, you can check all that other stuff on your list, but the O2 sensor on the civic vx seems to have a life span of about 15 years, some people exspect an errer code from the computer, but most of the time it will not have one, but if you replace the O2 sensor your problem will most likely go away, and if it's a choice of paying someone $300 to figure out the problem, or pay $300 to have the sensor replaced, then I say get it replaced.

[Sigifrith]

There's no need to pay $300 for an O2 sensor. eBay for about 1/2 that price.
Check TomO's links, I think he has the info there.

[bfg9000d]

First things first he should atleast get the codes check on the car then go from their. Being that checking the codes is probably the cheapest thing he can do right now before he starts replacing stuff. I have had allot of O2 sensors go bad normally I havent seen them act in this fassion when they go bad. The biggest thing I notice is I fail the emissions test. Which requires a new O2 sensor run it back on the dyno. Pass the emissions test. While I'm not ruling out the O2 sensor. The codes will probably reveal it. If not he can get and emissions test to see if passes.