Picked up exact spark tester.
Cylinder 1& 2 steady spark motor started and ran briefly
Cylinder 3 & 4 not as steady. Cylinder fired once on 1 and not at all 3. Replaced new coils with old coils on 3 and 4. Motor will start on all now:
Compression numbers:
Cylinder
1: 100
2: 110
3: 100...