94 Nissan pickup, 4cyl, 4x4, loses all power at 35 rpms. Have changed the fuel filter, dist cap, rotor, spark

After we have changed the above, now it will not even start!! It did start fine, and idled well. I bought it used, and it doesnt have an engine computer in it. How do i check the 4 sensors? What other ideas do you have?? A Nissan mechanic suggested changing a coil in the distributor,, we did, to the tune of $100+, then it wouldn't even start! The more we work on the worse it is getting. Help, please94 Nissan pickup, 4cyl, 4x4, loses all power at 35 rpms. Have changed the fuel filter, dist cap, rotor, sparkIf your check engine light is on you can get a diagnostic check and it'll tell you what sensor is bad. Have you checked your fuel pump?94 Nissan pickup, 4cyl, 4x4, loses all power at 35 rpms. Have changed the fuel filter, dist cap, rotor, sparkcheck compression of engine .go from there. sounds like a timing problem.