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The HF is the only CRX with an EGR, so if he has an Si or DX that's not the problem.

Try cleaning out the IACV and the FITV (or whatever the OBD0 equivalent is). There are a lot of causes for surging idle, but sounds like you have a cold idle/startup problem as well. Have you tried adjusting the idle screw once it's warmed up?
 
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