my p10 is only running on 3 cylinders replaced rotar arm distributer cap and leads still not working any help

Which cylinder isn't firing ?

Or is it firing but not creating any combustion ?

Test each lead indivually & if they are all providing a spark, you will be needing a cylinder pressure guage......

Which cylinder isn't firing ?

Or is it firing but not creating any combustion ?

Test each lead indivually & if they are all providing a spark, you will be needing a cylinder pressure guage......
it is not firing on no2 very week spark just changed the distributor
still not working

Well as the power for all of the plugs comes from the same place & you have replaced the Dist cap rotor arm & leads the only thing left in the circuit is the spark plug........