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There's no idle adjustment on the BAC on N/A's (at least S4's).
How did you check your alternator/battery? Make sure the alternator is putting out at least 13.5v at any/all speeds.
Also, don't add new grounds, it's just extra wires. The stock grounds have lasted up until now, so they're more than adequate. Clean the factory grounds, replace the bolts, tap/drill the bolt hole out.
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