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I have an 08 535 with approximately 25,000. The car now has now developed a rough idle. I notice at a stop light the rpm's seem to drop and then come back up. I have already had three fuel pumps in the car and I am not getting any messages such as "Reduced Power...". If I am driving the car it seems to run normal. I have gone through a couple of tanks of gas so I don't think that is the problem. Any ideas?
 

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Could be a fuel injector issue. However, without warning lights or fault codes, the dealer may not be able to diagnose.
 
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