Pathfinder 1999 doesnt start until i remove the airflow

SOURCE: 1999 Pathfinder shuts off while running.

It could be one or all of 4 sensors. the MAF, the MAP or the idle position sensor or dirty fuel injectors. the fuel injectors can be cleaned with an over the counter fuel injector cleaner bottle that you pour in your tank.If these do not fix it, it will be the EGR valve or a vacuum leak to the EGR. Check the fuel injectors first by buying the cleaning product. then check for vacuum leaks around the Fuel injector housing. Buying some starting fluid and spraying it over the small hoses while the car is running will make the engine stall when the fumes from the starting fluid get into the system. then have it scanned again to more or less tell which sensor it is. it could very well work with the fuel injector cleaner.

SOURCE: changed mass air sensor still stalling 1997 nissan pathfinder

As a factory Nissan trained Technician with dealership experience - it can be many things, but it sounds alot like a mis-adjusted or faulty TPS, and/or a faulty IAC(Idle air control) valve - I'd try the TPS and set to appx. .50 vdc (.47/.49) Volts DC and if that isn't it, I'd definitely look to the idle air control valve ( allows for air bypass - sometimes called bypass air control valve). May then need base timing and idle set at shop with OBDII ignition disabling option, for seting timing and idle, otherwise computer won't allow proper setting...then if connector to IAC is OK - should be just fine...

SOURCE: 2005 Pathfinder Heat Flow problem

I am having/had the same problem. My rear heater has not worked the last 2 winters, still trying to figure that one out. But I think I solved the front heat problem myself. The heater was blowing cold air while idling and hot air when the car was moving.

I jacked up the front of the vehicle, took the cap off of the reserve tank for the radiator, turned the car on and ran the heat (AC off) for 15 minutes. This is supposed to release any air bubbles in the coolant system and I did see air bubbles emerge as I was watching (this might be normal occurance, I'm far from a mechanical expert). Anyway, this did not immediately solve the problem, still blowing cold air as it sat there idling after 15 minutes. Dejected, I put the cap back on, lowered the vehicle and resigned myself to taking it to a dealer.

But a funny thing happened the next day, the coolant level was a lower (no leaks on the floor) so I filled up, and sure enough, when I started the car and let it warm up a little, hot air started coming out of the heater!!!

As far as my wife knows, I fixed the problem for the price of a bottle of coolant, so I am a hero...but at first I thought it didn't work. Here we are a month later and still blowing warm air and haven't had to replace any more coolant...the internet is a wonderful thing!

Hope this works for you, and I hope I can figure out my rear heater problem as well.

SOURCE: 1999 nissan pathfinders jerks and stalls

try replacing fuel filter

SOURCE: at a stop car jerks forward with brakes applied

Are the engine rpms climbing when its jerking forward? seems like it could be a Transmission torque converter problem.