1996 chevy blazer 2 door 4x4 has a very hard time starting after about 100 trys it cranks but now it is starting to stall as your driving down road. when it sits again it wont crank back up. ive changed fuel pump and filter.

If this only happens when you let off the gas pedal when slowing down clean the throttle plate in thew throttle body. That should at least help with the problem if not solve it.

I have 94 s 10..4.3 v6. it does the same thing have replaced fuel pump and filter,ignition module,cap rotor plugs wires,coil,ground strap...driving down the road jus dies like the key got shut off....for a while when troubleshooting through the parts you could get it to restart.....now when it dies it cranks really hard when trying to restart..ive checked the timeing its fine....if i wait a few min it will usually start...sometimes it will show a check engine light sometimes not......never know when it will happen sometimes jus down the the road from the house sometimes 100miles down the road......sometimes three times in a mile sometimes not for weeks at a time..Wtf...Im ready to shoot it like a lame horse....its a shame too its a sharp lil truck thats a two owner and never spent a night outside in its life...i knew the original owner ...i bought it with 90,000 on it it only has 148,000 now and still looks like new...

Try doing the following.

Engine stalling issue at low speeds

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

Replace coil

You could try changeing the fuel filter its located under the drivers door mounted to the frame in the fuel line . But the most likely thing that it could be is the fuel pump. You could check fuse # 9 its a 20 AMP in the fuse box that feeds the relay located in the glove box but on this vehicle even if the relay wore bad the vehicle would still start it would just crank for a longer time . the fuel pump has a beck up power supply also feed from fuse #9 that runs through the oil pressure sending unit. So if its not the fuse its the pump or a bad connection at the pump and that is located inside the fuel tank witch needs to be droped to replace the fuel pumpGood luck with it but this is a common issue with blazers

no its not the crank sensor if it were your car would not even start. your problem most likely is the idle air control valve, try removing it and and cleaning it if it does not help it will have to be replaced.

you may need all new plugs and wires. Now if you said you had a hard time starting it, i'd say be ready to replace the fuel pump, mine just went out last year at 90k. i have an 02.

U-joints.....seems like your vehicle wants to launch off the road?

I am not sure but you might want to check the pressure of the fuel pump.

It is inside the channel of the frame rail under and to the rear of the drivers door.