In as much as there is no answer at this point I would suggest you visit a custom suspension shop and get the advice you seek from them.
No.
Go to google images and look it up.
The 1988 Chevrolet Celebrity uses idistributorless ignition systems, the timing is controlled by the ECM. there is no provision for adjustment.
10w30, we used to own an 87, so we know.
I would suspect a failing ignition control module.
It is attached to the throttle body exactly opposite the cam/lever with the cable(s) on it.
I would suggest you take the car to an automotive upholstery firm.
yes usually from over revving
The only sure way is to remove it and have it tested at you local auto parts store.
That would tend to indicate that the alternator was not charging the battery for that interval.
Best I remember, it requires a star bit. About a T-35 or so.
Transmission fluid doesn't have a cap. It's added with a small funnel to the dipstick tube.