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I totally agree with what Herb said about your breather box. Test it for obstruction first before going after it. My car has 252K and the breather has never been out.
Use the procedure in the 700/900 FAQ. Here it is from memory... Remove flame trap and attach hose to lower flame trap hose which goes to breather box. Or alternatively you could remove this lower hose (can be a b*tch to get back on however!) and attach the hose directly to the top of breather. Remove oil cap and blow through hose. If you can feel any air at oil cap your breather is still okay...
IMO - The throttle body is good maintenance. However, I would only do the IAC if you felt it needed it. Why fix what's not broke? You could be opening up a can of worms! Same with the breather....
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90 244DL 252K - original engine/drivetrain :)
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