I recently (ish) picked up a 2010 G37x 7AT with 110k miles and have noticed some throttle lag, or just reduced power early in gear 1, only after I've been driving the car hard. It'll pull really strong if I floor it for the first time (after warming up), but after consecutively driving it hard for a few pulls it seems to reduce power on tip in. After it's rolling though, it drives fine. Any idea what could be causing this? Engine oil and transmission fluid are both new. I'm going to clean the throttle bodies soon so hopefully that fixes it but I'm wondering if it is something else since it only happens after a couple of pulls.

 

Just putting this out there but it sounds like heat soak. Car is good on start before everything is hot. You drive it hard, maybe while living in a hotter climate, and you experience heat soak problems until it cools again.

 

You need an oil cooler. It will keep the car consistent after multiple pulls. Especially since the weather has gotten hotter, your oil temp is probably reaching 240F-250F after multiple pulls.

 

What are running for intakes?