97 recon 1 weak spark

Whats up yall i have a 97 recon. also have a 2002 recon that has spark, but has alot of motor issues, bearings chains cracked block. Took the stator out of the 02 and put it in the 97, plugged the 97 into the 97 harness and 02 harness, same thing on both harnesses.
The problem it is having is absolutely no spark until like the last revolution (very very weak also) after i take the jumper cables off the solenoid. does anyone know what could be causing this?