I’ve got a gen 3 Hemi 6.4 engine with an a518 46rh behind it in my 70’s Satellite. The 46rh has overdrive and lockup.

When coming to a full stop the engine wants to stall. Then I throw the trans in Neutral and after the full stop I put it back into drive.

The 3 pin connector is hooked up but the Patc vacuum switches aren’t. The vehicle speed sensor isn’t used.

What can be wrong?