I have a 2003 350z Enthusiast. My car was running fine, and one day I started it up and it was having a cylinder misfire. The car has very little power and sounds awful. I changed the spark plugs but that didn't resolve the issue. When my mechanic ran a diagnostic scan it came back with a random misfire code P0300.

He said the problem was most likely a bad coil, and this has been a recurring problem on 350zs, Maximas and G35s. Unfortunately he can't figure out which coil is defective. Does anyone know if there's a way to narrow it down any further, or am I going to have to replace all of the coils?

If so, is there any difference with the after market coils as opposed to the OEMs? The price difference is significant, so I'd like to get the after market ones.

Thanks in advance.

 

You're in the 370 section...

You need a new mechanic, its very easy to diagnose bad coils, checking codes is not a diagnostic.