First, I'd ck oil nozzles are functioning along with omp to make sure seals are lubricating well enough to reduce poss gap between housing & seals.
How's them coils? It may not be putting out enough juice to plugs. Furthermore, when you do ATF procedure, I'm hoping, you used a dedicated plugs & replaced them afterward.
And I should've asked first, is it stock & have all EGR intact? It is a good possibility that them ck valves/solenoids may be inop... as well as vac hose may possibly got disconnected. So, I would perform vac leak ck procedure and find, if any, disconnected hoses.
As to compression, you know how to ck for compression by feeling exhaust pressure by the palm of your hand and you should feel the difference, if comp is low.
Another issue is your existing fuel. As you know, during cold season, especially, tank has a tendency to collect condensation and hopefully your fuel filters have trap the water. That's another simple inspection you can perform.
Hope my suggestions help.
Nonetheless, let us know how it turns out!
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