My 94' blazer has the 4.3 vortex and has a rough idle when starting and no power when applying the accelerator. It try to stall when you hit the gas and only does about 8 mph when we put the accelerator to the floor. We have replace coil, ignition module, cap and rotor, map, idle position sensor, fuel filter, have clean the EGR valve, and have replaced spider injectors. We are at the point the where we have no ideas. Any help is greatly appreciated

 

I'm not sure if I'm just not seeing it, or you haven't touched the pump yet. Wondering if its weak..

 

I've had this problem with a '94, turned out my o2 sensors were cut off by previous owner AND the fuel pump was trash. I'd do a fuel compression test if I were you; super easy and can at least eliminate or confirm that there's a problem in the fuel delivery system.

 

Sounds like doing a fuel pressure test and leak down test might be a good start.

 

OP hasn't been on since 7/21/19... think this thread should get closed lol...