Mine did EXACTLY this and only when it was cold. It's the starter. It will get worse until it won't crank anymore. Starter is around $400 +core.
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--Marcelo
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors
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