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I Have bmw 328 XDRIVE 2011 and 120 k kms on it .when I start the engine rpm idle takes 1 minute 35 seconds to come down at normal and it misfire on uphill with ac on or you can say underload.I went to mechanic and he took test drive he said it is misfire but wondering why engine light is not on .this problem getting worst and worst day by day.mechanic said he can't diagnosis without engine light check or until he gets any faulty code.

* i bought this car been like 6 months ago with 110 k kilometers on it.
*My dealership changed the sparkplugs and ignition coil pack ?
One more thing I forgot to mention that gas mileage also dropping down day by day.
 
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