Odd purring sound after transmission flush and air filter change

moltar

Member
Not sure what caused this, as I did both at once. The sound is like purring. Sounds like I got a sweet cold air intake. But only between 1,000 and 2,000 RPMs. Only on D (Drive) and not on R (Reverse). Sounds both when idling and driving. Any ideas what can it be?
 
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