5.2 magnum options

If your compression is that even across all cylinders, you do not have a mechanical problem.

Get a bottle of Windex, water, other rapidly evaporating non flammable fluid. Allow motor to idle normally until warm but not running temperature. If headers, begin sooner, if manifolds, wait a little. Spray each exhaust individually right at the head a couple times. Watch for how the fluid evaporates.

If the cylinder is running well, that cylinder will boil water/Windex right off, especially with headers. If not, it will be slow to evaporate. On a dead hole, it will still evaporate off but much more slowly. (Even a dead hole generates SOME heat. If it has any compression at all. )
the key is don't do this after a drive, the heat will spread to adjacent cylinders and the compression will heat everything.

This will tell you if it's one cylinder, or a roving issue, regardless of issue.

I suspect it is an ignition issue, as compression is even, a lower intake leak would result in oil consumption, and an upper intake leak would be found as tested.

I'd put in NEW plugs (they're cheap. Don't you be), fresh fuel from a different station than the one you go to for the cheapest smokes (drain the old and give it to your neighbor with the dogs that bark all night. )

If it's single cylinder, you'll know it by this point. If it's a roving issue and new plugs didn't help, install a stock ignition system, which points would be simplest. Reuse nothing. Ytest and follow-up