Gas Recirculation Valve (egr Valve) problems of the 2004 GMC Yukon

Vehicle started fine, then as I was driving in neighborhood engine shut off and I lost all power, could not turn car without steering and crashed into curb up the street, car would not start, had aaa come tow to our home. Had a new battery, and would only take a charge when bypassing battery directly into engine. Now something is draining battery and if I don't start and run every two days , battery dead. Electrical cluster also going bad and instruments not working, air conditioning electrical problem , will blow cold out of all but two vents, where it blows 90 degrees. Back window wiper stopped working, all electrical related. Dealer said no error codes test drove for a week to get to reproduce stall driving, returned to me saying can't diagnose. So frustrating and dangerous.

Hello over the last two weeks, my truck has had the following intermittent message flash across the dash "reduced engine power" and "stability system disabled", and the truck is limited to 25mph. . This has happened numerous times in traffic, forcing my wife, or myself to have to turn on the hazard lights and pull off the freeway as quickly as possible. After sitting for 5-10 minutes the lights will go off, and the engine will be fine. The described scenario just occurred again today for the 3rd time in one day,, so things appear to degrading rapidly, and I will need to have the system reviewed at the local dealership. . Read more...

While driving 75 mph on a 102 degree day, my fuel tank was at 1/2 full. The engine stalled and I lost all acceleration, making it dangerous on highway conditions. When I slowed to 20 mph at the side of the road, I lost all power of steering and brakes. I experienced "vapor lock" according to the gm certified technician who evaluated my problem the following day (under a cool engine condition). He found no defects with a cool engine on a 60 degree morning.