2005 Infinity g35 sedan showing a P0303 code, what is that?

Question

car kinda seems like it is miss firing when sitting at a traffic light.

Answer 1

HI there

This code is for a misfire on cylinder 3 which is why it's feeling like it's missing. There could be several reasons,, but the most common would be the coil on cylinder #3. Here is a list of other possible causes as well.

P0303 INFINITI - Number 3 Cylinder Misfire Detected

Read more: https://www.autocodes.com/p0303_infiniti.html