2004 chevy trailblazer sputtering and turning off

Sound,s like a fuel problem,check fuel filter,s and fuel pump.

Just replaced fuel filter, no change.

If you are still having trouble, you may want to ask about reprogramming the computer. When you change parts on these new vehicles, they require relearning to get everything back on the same page. Sensors like the crank sensor, the knock sensor, and I would think that changing the key cylinder would also need to be relearned since it is an anti-theft part. Not all shops can do this so call around and ask. You don't have to go to the dealership, most reputable shops can do it. Hope this helped.