My 2001 Tahoe starts up runs for about 30 seconds, then feels like a couple cylinders run rough and it dies. It will start right back up. It has the 5.3 liter, 4 wheel drive, with 140k on it. Started doing this today out of the blue. Any ideas of the cause? Thanks in advance for the help.

 

Need to try see what it looses when it quits fuel or spark.
My thoughts are intermittent fuel pump .. Hard to catch but can.
If you get a fuel pressure gauge .. watch it close see if you see pressure
Drop right before it quits.

 

I have the problem ~145k miles, but started around 120k. I tried cleaning my Mass Airflow Sensor which improved performance, but it still stalls. I think I have tied it to my A/C cycling on an off but cannot figure out how to fix it.

 

Try or check map sensor.