Im new to the forum and I have a S10 pick up. I have been trying to find the problem and need help before I pull my hair out. My 2000 S10 4.3 I thought that it was a fuel pump and replaced it. Truck runs for three seconds then shuts down. I have relearned the key trick and didn’t work. It has spark, fuel pressure. Tried to connect the OBD reader and it will not communicate.
Does anyone one have an idea?

Thanks