Air is as important as fuel

Recently my Pathfinder had been going off by itself while it's idling.

I initially thought it had something to do with the fuel pump, but I just changed that.
So I filled my tank above half tank just to see if it was the fuel pump not getting enough fuel, but to no avail.

I then thought perhaps it had something to do with the engine or electricals.
Checked all the ports, the fuel filter etc.

Still it still kept going off.

I didn't think to check the air flow into the engine... I just didn't think the flow was insufficient.

But alas there was a leak detected when I took it to my mechanic's workshop - the leak was so inconspicuous, but quite significant.

It took just changing the rubber sealing - a less than $1 fix🤦.

It just proved how important air was to the engine performance.