Misc. Electrical problems --> Computer?

96 Dodge Caravan. 3.3L engine. 140K-miles. I have a flock of intermittent electrical oddities that lead me to wonder whether they are not largely computer-related.

The wipers (which are really the main question) are erratic in any of the intermittent speeds and might park improperly or fail to shut off in any speed setting. Much worse in cold weather. Occasionally continue to run even after I've gotten out and locked the door. Swapping a different relay to the wiper position in the control box didn't help. Wiper switch has been replaced without helping. Front washer motor recently quit. Rear washer still works, as does rear wiper.

4-Way Flashers occasionally fail to shut off, or shut off without restoring turn signals.

The first shift after starting, the transmission occasionally fails to engage any forward gear, then finally lurches into gear. This has been happening for 5+ years. Fluid level is correct, though the tranny does leak these days.

Occasional hot blasts from the climate control system that seem to correct with a few swipes of the temp control. Two of the intermittent speeds of the heating/AC fan have stopped working. (My inadequate Chilton manual gives me no clue whether these are controlled by the computer.)

I confess I haven't looked at the Mitchell manuals available here on line yet.

Thanks in advance.