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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...
Most often that is a symptom of a fuel pump beginning to fail. As it runs, it begins to overheat and bind. After it cools down, it frees itself up and then works again. However, the same problem can also be caused by a crank position sensor going bad. Next time it happens, turn the key on while someone listens to hear if the pump (inside the tank) is running. If not, likely that's what is failing. Crank sensor can be tested with a digital ohmmeter, but many times it will not show up as bad until it completely fails.