Electrical problem
2000 GMC Yukon V8 Four Wheel Drive Automatic 170000 miles

I've owned this truck for over a year now and havent had a single problem. Last night while driving home from work, I was sitting at a stop light (after about 20 minutes of driving) and the car stalled at the light. Now the car will start, idle rough for about 5 seconds, then stall. It just wont stay running. I hear the fuel pump working, I have pressure in my fuel rails, I checked the fuel pump fuse and seleniod, and its not that. Do you have any ideas on what to check for. If i unplug my TPS, same thing. If i unplug my mass air flow sensor, same thing. I no clue where to go from here, and I cant get it anywhere to get the code read. Please let me know what you think.

You really need to check the fuel pressure with a gauge. It might not have enough pressure. As for the codes, it should be scanned as well. You can check our online store for an inexpensive scan tool or code reader and have it shipped directly to you. There is a link at the bottom of this message.