1993 ranger 3.0 4x4 66,000 miles has rough idle

[93Ranger85]

So I've got a rough idle issue I've replaced everything almost I've got new computer full tune-up new distributor intake gasket upper and Lower checked whole wiring harness no breaks or shorts all grounds are good timming dead on 10btc. I'm at a loss with my truck I've done everything my scanner will not let me comunicate with my ranger please I need ideas or solutions I've done compression check too it's all good

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[Kona]

For the issue with the scanner not talking to the ecm try replacing the maxi fuse under the hood for the ecm ( to test switch with a same color/amperage from say -- air conditioning or something else the truck does not need while running) I had that problem, and that worked for me.