http://engine-codes.com/p1440_nissan.html
I also had P1441 along with the P1440. The charcoal canister failed and was sending little pieces through the line and plugged the Purge Volume Control Valve, causing the "check engine soon" light to come on. My pathfinder still started and ran before i fixed it, so i don't think it's the P1440, that could just be a bad gas cap or it didn't seal properly after a fill-up. Sounds like you have spark since it fired with starting fluid, so i'm thinking it's a fuel problem, how is the fuel filter new/old?
http://engine-codes.com/p0180_nissan.html (Faulty Fuel temp sensor, shouldn't prevent it from starting.)
Here is an interesting read...
http://www.justanswer.com/nissan-infini ... ector.html (Distributor)
Let us know what you find.