Lincoln/Mercury Repair: 95 nissan altima stalling, mass air flow sensor, air flow sensor

Question
I have a 95 Nissan Altima GXE automatic with 127k miles.  The car is stalling at idle and upon deceleration.  Basically it stalls whenever the rpm's drop too low.  The car will start right back up after every stall.  The check engine light never came on during the stalls.  The check engine light came on after I took it to the shop and two codes came up on the scan: mass air flow sensor and knock sensor.  I changed the MAF and it still stalls.  I don't think the knock sensor would be the culprit.  I also changed the fuel filter and fuel lines but still stalling.  The car cranks up fine in the morning and starts stalling after about 10 - 15 minutes of driving.  I live in florida so there's no cold weather.  Any ideas?  

Answer
Hi John,

Replace the knock sensor! This will definitely be the problem.

Knock Sensor: A sensor mounted on the engine that is designed to detect the high-frequency vibrations caused by detonation. By employing a knock sensor, a computerized engine-control system allows an engine to operate very near its detonation limit: thereby improving power and efficiency.

If the knock sensor is shorted it will advance timing too far and stall the engine. If it is out of the loop then timing will be retarded and stall the car.

This is absolutely a sensor issue. Not a tune issue, though, I would have guessed the MAF sensor which is integrated with the borometer, altimeter, temp sensor,  air flow sensor and a few others.

Keep me posted on this, I love a challenge!