It sounds like your having a transmission problem.
There is a lot of things that could cause this in a transmission, including a bad siloniood or it could be a clogged filter.
Look at getting a new transmission
My '89 new yorker weighed 3280 lbs when I sold it for scrap this morning.
It is behind the battery.
Yes.
the fuel pump is located in the gas tank
It is under the housing where the upper radiator hose hooks to the engine.
maybe an ECU problem
through the tranny dipstick tube with a tranny funnel.
1-2-3-4-5-6
The engine computer is the voltage regulator. It is behind the battery.
Once the computer tells the transmission to downshift the car should in theory downshift just as quickly as it upshifts.
The 1988 Chrysler New Yorker typically came equipped with a premium sound system that included a total of four speakers. Depending on the specific trim level and options, some models might have had additional speakers or enhancements, but the standard configuration featured four.