99 Maxima misfire

What do you mean when you say you "checked the coils"?

If the car is misfiring at idle, you can disconnect one coil at a time. When you get to the cylinder that is misfiring, disconnecting the coil will have no effect on how the engine runs... that will help you pinpoint the bad coil/injector/plug.

As an aside, you have a 99 Maxima. That model year is prone to iginition coil failure, so I'd bet that bad coil(s) are your problem. The only fix is to replace all 6, because they will all fail eventually.

You can buy coils online at a discount from pinnacle nissan, courtesy nissan, jerry rome nissan, etc.

I assume all the other maintenance is up to date (plugs, filters, etc.).

Cheers, Nirav

In my 99 Maxima with 72k, I have similar misfire even after replacing one coil from CEL code. Many have solved this problem by replacing MAF sensor which is what I expect I'll have to do. Does anyone know if there is a diagnostic protocol? It seems the dealers want to replace coils and O2 sensors before they look at the MAF sensor.

As already mentioned, you have to replace all 6 coils.. it's unlikely that your MAF is causing misfires (if that's the CEL code you are seeing).

Nirav

i am well aware of the coil problems in the 99 max. my main question was why is the misfire gone when i use injector cleaner in the tank. i am getting no CEL codes at all.