Change coil packs and plugs but no misfire po350 code

 

Did you have this code BEFORE changing that stuff?

 

Yes

 

I had the misfire changed the coil packs and spark plugs and the code is still There

 

Clear the code and see if it comes back, might just be held over from the previous malfunction but was never actually cleared.

 

I have comes back on

 

In that case I would start ringing all those wires out back to the ECM and IPDM to verify it's not just degraded wiring.

Steps are in the FSM section EC - Engine Controls, look up codes P0300 - P0306 for the wiring.

There is also an ignition condenser that you should replace, it's a very inexpensive part and capacitors do wear out.

Also check the grounds, particularly the engine-chassis ground on the passenger/right side of the timing chain cover that goes to the chassis below the coolant reservoir.

https://www.nicoclub.com/infiniti-service-manuals