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2016 Ford Fiesta S / 103,747 miles / Manual transmission / No error codes.

For the past couple of weeks my car has been idling strange. Usually, after I start the engine the idle increases to around 1200 rpm and then settles to around 900-1000 rpm after about 15 seconds. Now after I start the engine, the idle increases to 1200 rpm but then immediately drops to around 900 rpm then back up to 1200 rpm continually up and down. It feels "rougher" than usual and sounds like it might stall out if the rpm drops any more. Also, the exhaust smells more pungent/rich than usual but the fumes are clear/ no smoking. Any ideas? Thanks.
 
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