i read on Nasioc that a similar problem on an Impreza was solved when the guy put in some aftermarket fog lights. he felt that what actually fixed the rough idle and hesitation was the additional grounding on the ECU.  maybe add an additional ground wire to the ECU - it would be cheap and easy to try.
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Alan
1987 928 S4 (Black) SOLD! 
1997 SVX LSi (Ebony) SOLD!
2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD!
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2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+]
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