Hello Everyone....My wife's 2003 Trailblazer is doing something very strange. The other day, she was driving it and when she was almost home, it shuddered and then stalled. It started right back up and she got home. The next day, she went and got some gas but noticed on her way home that it did shudder again but didn't stall but she also noticed that the driver side turn signal was blinking real fast. I checked it out when she got home and figured it was one of the bulbs....BUT, I also noticed that the headlights on the driver front were very dull too. Passenger side were all good. So I checked all bulbs and then figured it could of been the taillight circuit board so I pulled that out and here's where it really gets strange. When I pulled out the rear turn signal bulb from the circuit board, the front were still dull and the front directional still blinked quickly. But when I would plug in the rear bulb again, it actually affected the engine idle. Eventually the engine did quit and then would not start back up....as if it was starving for fuel. I figured it must be a ground issue but after checking as many as I could find, and cleaning them up.....it still does the same thing.....dull headlamps on driver's front and quickly blinking directional's on same. Anyone have any other ideas for me to check. I even pulled out the alternator figuring maybe it was shorting out but it still does the same thing even with it out. Any help would be greatly appreciated......THANKS!!!!!!