I've had my 370 for just under a year now with 13k miles and noticed the same thing but at higher rpms in 5 or 6 gears, usually when the car is warm. I installed a Stillen gen 3 long tube intake a couple months ago and the car runs smoother but same issue every now and then. It feels like the car wants to go faster but doesn't and produces a smell if I push it. I noticed it on the way home from work the other day in 5th gear where I usually have the most torque. I've reset the ecu once since owning it.
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