Why does my engine keep stuttering and stalling at low speeds?

Try some general maintenance things first. Check air filter clean throttle body replace fuel filter if have not done so in a while add Lucas Fuel Injector cleaner to gas tank.

Here's a pretty good thread on a forum asking your same question: http://forums.edmunds.com/discussion/5201/chevrolet/blazer/chevy- blazer-starting-and-stalling-problems Also: To add to the answer that was given by @firebird338, which is probably the best answer someone could give you without more details...so definitely try what he/she's suggesting - While Lucas has decent Fuel Treatment, it will only do its job for MAYBE a few months. Instead, use SeaFoam (it's a white, 'spray- paint'-looking can). It'll run ya a few more bucks, but you only have to put it in your gas twice or even once a year. The cheapest I could find it for was $6-$7 and that's at walmart, here's a link if you'd like to check it out for yourself (you'll notice it has 5-star reviews across the board..I personally love this shit): http://www.walmart.com/ip/16664932? wmlspartner=wlpa&selectedSellerId=0&adid=222222222270175630 59&wl0=&wl1=g&wl2=c&wl3=57996458928&wl4=&wl5=pla&wl6=81 965762208&veh=sem Good luck!