smokey muffler

[Terry Fojas IV]

Moderate amount of white smoke coming out from muffler and hearing like a suction sound after releasing gas pedal. Signs observed while car is parked. Car is a 2015 Kia Sportage with only 28,000 miles. Smokes are heavier when car is not driven for 2 days or so and less smoke when driven every day. Last thing i did was using fuel injector cleaner in full tank a week ago because wife complaining of car jerks while in complete stop at traffic light. No jerk issues happening yet though. Thanks for any help.

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[Terry Fojas IV]

Upon further investigation, there is no thick smoke during the day or after driving for a while. But the noise is a rattling sound coming from inside the muffler. It is very loud at the exhaust where smoke comes out. I pop up the hood and i dont hear the rattles in the engine area.

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