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I didn't think that a 325e has a vacuum advance system. Really I am more familiar with the 318i. Are you sure that you have adequate fuel pressure and volume? Is the miss sharp like an electrical miss, or more of lean fuel surge. It sounds like you are describing a surge.
Find a forum that has regional sections and ask for an independent mechanic in your area. The car may not diagnose itself, but it is certainly fixable.
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