Recently bought car. Yesterday morning. I was at a traffic light, while waiting for it to turn green I noticed the car rumbles were louder for some reason. I shifted it to neutral and the rumbles got quiet, but then when the traffic light became green I shifted it to drive. The car wouldn’t accelerate, it was going like maybe 5kph, even while flooring it. the car just wouldn’t speed up. So I stopped on the side of the road. Trying to restart the car, there was a lot of hesitation. It was still the same. Took me around 10 tries to get the car back to normal . Any advice or help would be greatly appreciated. (2013 G37 IPL Coupe)

 

Mileage maintenance history modifications?

 

Qi intakes and magnaflow cats

70k miles