so i was driving today and 1st thru 3rd gear seems normal but when i shift into fourth it starts to misfire and when i accelerate in 5th it does the same anyone know what the problem is?

it cant be new sparks already..

 

It's the factory tune. A reflash from the dealership will fix it, but good luck getting it done. They won't reflash mine unless it does it while they're driving it, and it only happens to me every other week or so. I'm getting dyno tuned this weekend though so it'll be fixed without those bastards' help.

 

Lol and I thought I was emotional about crappy customer service.

 

what gas did you put in it???? sounds to me like a tank of bad gas happened in my 350z