Fwiw, I've been chasing a shifting issue for the past 9 months. Happened just after I went through a water crossing. Shuttered, stalled, then idled rough. Wouldn't hold an idle either, if left unattended it would stall out. Rpms at idle were between 2k and 4K. In addition, my cruiser would prematurely shift into third, basically shifting from 1st into 3rd. Not confidence inspiring when merging into traffic! Oh and ALL of this with no CEL. FFFFFFFF!!
So I tried new plugs, rotor, distributor cap, replaced both the battery and alt as it needed it anyhow, performed a Trans fluid exchange, cleaned the throttle body, discovered my fuel filter had been deleted...eventually took it to a shop to little avail.
Been lurking the forums extra hard these past few days looking for an answer and found this thread and a couple others where
@SUMMIT CRUISERS suggested the culprit could be the NSS. I pulled mine apart re sat the rubber boots looked at the blades of the male end and they looked good, at which point, my heart sank a little. But I thought, " Eff it, it's open, time for some dialectric grease" I filled the cavity snapped it back together, took it for a drive, AND IT SHIFTED LIKE A DREAM!!
It's a bit early to claim victory but I'm feeling really optimistic.
Next step is to make a splash guard as my OEM has been missing for some time.
