I looked at all the wires and plugs connected to the battery and the alternator. I don't see any corrosion and none of them are loose. Lately, the previous symptoms aren't showing up as much as before. However, my check engine light came on yesterday. Auto Zone scanned it and gave me these two codes: P0705 (Transmission range sensor out of position) and P1237 (Fuel pump secondary circuit failure). Since getting the engine light, I've only driven the car to Auto Zone, which is just a half mile away.
I plan to borrow some ramps and look underneath the car this weekend to check any wires and connections I can't access from above. When I looked at the "probable causes" for the two codes I got, "open or shorted circuit condition" was on both of them. My first instinct would be that these are related to the problems I experienced at first. Does this new info shed any light on my problem?