Acceleration lost/gain after turning head lights off
 

2009 370z auto, 150k miles. Recently started losing acceleration and Rpm will not go over 1.5-2k. Only when I’m driving with lights on and doesn’t do it immediately, usually after about 30 min of driving. I believe it’s a drain somewhere but shows 14v on dash, and battery has 12.9v while off and 12.7 while running. Also, when I say loss of acceleration I mean 40 mph max flat surface and will newly come to a complete stop on a long hill. A few times It has picked up and drove normal for a few minutes before reverting back. Just wanted some input before I take it in. Besides that only other issue is minor condensation in tail light which I will replace (not sure if that will make a difference but have seen threads where some said changing that fixed electrical issues).

Does sound a bit like a drain. But your best bet is to pull any DTCs and report back.

So far no warning lights but will run a OBD just in case. Before I found out about it going back to normal with the lights, I cleaned MAF and Throttle Bottle extremely well.

There are lots of codes that will not illuminate any warning lights. Based on your symptoms there's almost a guarantee that you have at least one if not several codes triggered.

check at the battery terminals with car running light off and then check again with lights on. If you have a huge voltage drop with lights on then you at least know its not the charging system and something with the lights. Aftermarket headlights?