There is no way to post the detailed description plus illustrations that would help you do a brake job. I would suggest you consult either a Chilton manual or Haynes manual to help you do a successful brake job on your Chevy Celebrity.
You have to remove the instrument cluster to service the light bulbs.
The MAP sensor on a 1987 Chevy Celebrity is mounted to the firewall near the right fender.
The idle speed on a 1987 Chevy Celebrity is controlled by the engine computer, there is no way provided to adjust it.
The timing on y our 1987 Chevy Celebrity is controlled by the engine computer, there is no way provided to adjust it.
no
The fuel filter on a 1987 Chevy Celebrity is next to the fuel tank on the driver's side of the car/
The heater core in a 1987 Chevy Celebrity is in the heater plenum to the right of the hump and below the glove compartment.
The timing on a 1987 Chevy Celebrity is controlled by the engine control module, there is no provision for adjustment.
It is the main computer box.
Yes
I would replace the lock cylinder.
Here is a fact sheet on the Chevy celebrity http://auto.howstuffworks.com/Chevrolet-celebrity.htm/printable I found this really interesting