Hello all. I'm back to try and figure out the issue with my 99 maxima. Ever since I've had the car (a couple years, ~15k miles) the car runs really rough after warming up while accelerating. It only seems to become a problem after running for 30+ minutes. When I try accelerate I either lose power or it will start shaking until I back off the gas. I have a cheap scanner that I would use to check the codes and they would always been p0400 and p0500. I took it in sometime over the past year and the mechanic replaced the EGR valve but the problem persisted. At some point I had also noticed that exhaust was really loud and the muffler replaced in the last month. The SES light is no longer on but I still have the issue and now i'm getting a p1320 error code. I was thinking about replacing the ignition coils but i'm worried i'll be wasting money on parts that don't need to be replaced and still have the issue.

 

Your car looses power when accelerating. Maybe it's not getting enough gas, or insufficient pressure.

How recently was the gas filter replaced?

 

+1 to fuel filter replacement. That is a regular maintenance item.

Here's a video about testing for the P1320 code. Note the video comments posted and information links.