2002 Trailblazer 4x4 4.2L Vortec; starts easily then immediately shuts off as if ignition is turned off.

SOURCE: 2002Chevy trailblazer engine cuts off when heater & ac is on

remove the airintake boot and clean throttle butterfly with a rag and carb cleaner

SOURCE: key stuck in ignition of Trailblazer.

There is a small 1/4'' oblong cover plate on the underside of the stearing column. Pop this out and there is a button you push in ( like the Crysler key relase) and this will allow you to remove the key.

SOURCE: ignition switch on a 2002 chevy trailblazer

under the steering column, there are three or four little holes in the plastic covering. If you look inside, one of them (the one on the right side toward the dash) there is a brass pin inside. This is the pin to release the key. As far as the key not turning, I have had the same problem. The first time I replaced the ignition switch and that solved the problem. However, this makes no sense because the ignition switch has nothing to do with the tumbler being locked. GMC thinks that my anti theft system, which is inside the ignition cylinder is the problem. By removing the ignition switch, it reset the pass lock anti-theft system and temporarily fixed the problem. So, try removing the ignition switch and then plugging it back in. If that doesn't work, your in the same boat as I am, and we may both need new ignition cylinders.

SOURCE: My 1998 Chevy 2500 vortec 4.3 v6 van starts and dies instantly

sounds like your engine immobiliser fuel cut off is activating.try taking battery teminals off,re-connect and re activate your immobiliser fob the usual way,**** it will re-set itself,& or your fob battery may need changing,it,s anti-theft cut off that is your problem.good luck.

SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?