Hi, girl that is brand new to site bear with me please. I have an 01 blazer (S10) with 133,000 miles that is sputtering. I have replaced the following all within a 4 month span. Radiator, fuel pump, ignition coil, plugs, wires and cap. She will run but while driving she will sputter. It's hard to merge on highway when she has little giddy up. I'm scared to drive because I can't afford another towing bill (4 times so far). I did put in a bottle of heet and gas is full. Please help, extremely frustrated. Any help would be appreciated. Thanks!

 

Did you replace the fuel filter ?

 

or could be even worse the fuel pump. just worked on a astro van kinda the same issue, if you floored it it would fall on its face or stumble if giving it a half a gas pedal. going slow and idle it was fine

ended up being the little hose that attaches the fuel pump to the sending unit sprung a small leak and was spraying a lot of pressure out of the pump.

soon as we put a fuel pressure gauge on it would go up to 55psi, soon as the pump went off it dropped to 0 almost instantly, it should hold the pressure. so maybe pressure test it or bring it somewhere to check the fuel pressure