A loose battery cable can cause your vehicle to on most stall and it can cause the lights to Flickr. Make sure your battery cables are tight and free of corrosion.
Classic symptoms of the Trailblazer Vortec 4200 Inline six cylinder engine with a dirty Throttle Body. www.trailvoy.com
I've had this happen to me years ago. You can have an auto parts store test your alternator and hope that's it. But in my case, it was a warped head.
There's a solinoid in the transmission.Suggest to check that first. Turn on interior lights. Start engine. If the lights go out when the engine stalls, you have a bad ignition switch.
Turn on your headlights and hazard lights, call 911
Have your alternator checked,also look at your drive belt to see if it's worn. And look at the belt tensioner to make sure it has the proper pressure on the belt.
first is the air on you may need to thoroughly clean the air mixture assembly where the breather tube connects the engine
While driving, the dashboard lights will fall and the car will stall if the vehicle goes dead. This can be caused by a lack of fuel or mechanical failure.
Check the plugs/ wires/ coil. Check the fuel injection. If that still doesn't fix it, you've got a bad cylinder.
My car did the same thing, is your lights affected? If so it's your alternator.the lights are not affected. i mean they cut out when the car stalls out but isn't that typical?
You may find helpful information here: http://wiki.answers.com/Q/Why_would_a_car_stall_when_idling_at_a_stop_light
This is a dirty throttle body. Very common on our trucks.
Shift into park or stop at lights and stalls etc could be a bad fuel filter.