Wasn't sure where to post this but i've put it in here anyway!
It's not my engine, it's my mum's 316 (I think) coupe BMW 52 reg. When idling the revs would sit just below 1000 for about 5 seconds, then raise to 1500 for about 5 seconds, then back down, then back up, and so on, following the pattern. Any idea what this could be?
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