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In my experience, a dirty throttle body will not set trouble codes unless it causes the idle rpm to jump around and nearly stall.
Your 2-3-2 code means that there is too much/little intake air or too much/little fuel AT IDLE. Either this is actually happening or there is a sensor problem that is causing it. It is not an idle control system problem and very unlikely that it is an ignition related problem. The fact that this code is being set only at idle and you are not also getting 1-1-3 or 2-3-1 fuel trim codes under full or partial load is significant. If your engine is basically running smooth then that is also significant. If you have checked for intake air leaks (air intake tube, vacuum lines and throttle body gasket) as you indicated then you've pretty much eliminated that common problem area.
The fact that you have tested out your AMM and O2 sensors as being relatively healthy should be cause for you to be looking elsewhere. I would be surprised if it's your AMM -they tend to cook and fail outright, not go out of spec. There is really only one other sensor that could be involved and that's the O2 sensor which is apparently your current suspect. I'm betting (although this isn't a sure bet by any means) that a replacement O2 sensor isn't going to make any difference. I think a lot of O2 sensors are replaced simply because they are the messengers (detectors) of a problem that lies elsewhere. Again, if your O2 sensor was shot then I wouldn't expect you'd be getting only a code related to idle running conditions.
I'm still betting that the FPR diaphragm is starting to leak. It may not be providing the proper fuel pressure at idle when vacuum is low. At higher revs there may be enough vacuum to operate properly. Have your read the 700/900 FAQ feature section topic on FPR's? If you haven't used this part of the site you're missing out on a lot of good info -much better info than the typically pitiful diagnostic stuff in your Haynes or Clymers or whatever. It specifically mentions the 2-3-2 code. Any gas smells when you open the oil filler cap? Did you perform the basic FPR test as I suggested. Did you check the fuel pressure regulator vacuum orifice as I suggested?
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Dave -not to be confused with a real expert
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