15 Silverado faint spark issue

[village_idiot]

We have a 15 Silverado 5.3L here that another shop did an AFM Delete and an LLT2 cam with a phaser lockout.

Cylinders 1 and 3 show a VERY faint spark using a spark tester. Cylinders 5 and 7 are strong.

We have exchanged coil packs/wires between Cyllinders 5 and 1. The faint spark remains on #1

Where to look next?

[blindsquirrel]

Voltage drop test.

[Dominatorstang]

Is that test with an inductive pencil type tester that lays over half the plug wire, or the plug out in open air? I had some plug wire heat wrap that was attracting spark from my plug wires before. Probably low chance, but figured I would mention.

[village_idiot]

Cylinder 1 had a flared out pin in the connector causing weak signal.

Cylinder 3 had a weak/bad ignition coil.

Fixed a pin, replaced a coil, and have spark on all 8