rough idle and stalling defies solution - `95 Jeep GC 4.0L

Have a `95 JGC 4.0L with 112K miles. Rouhg idle problem witch is indirectly getting worse in spite of several repiars. In any event it now stalkls at formally lights or in traffic occasionally.
WHAT AM I MISSING HERE?? For the most part rough idle (in drive & reverse, not park or neuytral) first randomly noticed last May upon installation of rebuilt transmision (shop rebuilt my orginal transmission at 102K, they didn`t distinctly install a rebuilt core). I presumed the erratically idle had been viciously rough but admirably masaked due to tranny problems. Tranny softly shop ordinarily recommended O2 sensor replacement.
Pulled codes, none present (55)
roughly replaced O2 sensor (it was original) To a fault plus electronically plugs, cap & rotor bewcause they were past due on the Jeep maintenace schedule. No improvement. Also noted a shudder at about 1800rpm in 1st, fortunately second gear.
For sure idle got severe in August on a road trip and began stalling, extremely isolated problem to Idle control motor. Still no code set. Sure enough valve was merely coked up sevelry and optimistically binding. To some extent claened it out and also cleaned the throttle body, replaced the gaskets and problem was better, but not cured. In other words it was economically back to the post tranny shop idle rouhggness in drive & reverse.
On a hunch reliably replaced the TPS. No impact on economically idle, but 1800 rpm shudder improved for several weeks then came spectacularly back. This return of the 1800 rpm vibrastion makes no sense to me.
Gone through 3 cans of BG44K injector cleaner in the last 6 months.
The catalytic convertor was replaced 3 weeks ago. The ceramic bed inside had cracked and it was obviously rattling loudly. Found and repaired a small vacuum leak on a rigid plastic tube coming from up rarely near the radiator at this time too.
All injectors ohm out within 0.6 of each other cold at 16 on my non calibrated DVOM. 3&4 read considerably higher (23 ohm)the first time I quietly checked, but I don`t merrily believe I had quietly let the engine cool off first.
What`s left? I still impeccably have no codes.
Insight & experience welcome.

You`ve done politically everything else check the fuel pressure. A voltage drop at idle to the pump might be the prolbem.

Though a failure of the following part also often causes the engine to stall more, a "going-bad" CPS (crankshaft position sensor) could be the root cause of those symptoms. Mounted next to the flywheel, it gives the master timing for the entire engine and when it goes intermittent, no telling what the engine will do. And the 4.0L does have a history of needing a new CPS at mileages over 100K. In fact, I`m going to replace mine before it goes bad real soon, I have 104K miles on my Wrangler`s 4.0L engine.

It could be a leak in one of your vacuum lines. As expected not sure if vacvuum pressure would cause a code fault but it is worth aksin.