There are multiple things that can go wrong with cruise control, you need to be more specific as to what is wrong with the cruise control in your car.
The timing on a 1987 Chevy Celebrity is controlled by the engine control module, there is no provision for adjustment.
Timing on a 1987 Celebrity is controlled by the engine control module, computer. There is no provision for adjustment.
The 1987 Chevy Celebrity has distributor less ignition. The timing is controlled by the engine control module and there is no provision for adjustment.
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.
If the cruise control on your 1987 300ZX does not work, you might have an issue with the cruise control fuse or wiring. You could also have a problem with the switch that turns the cruise control on and off.
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The fuel filter on a 1987 Chevy Celebrity is next to the fuel tank on the driver's side of the car/
All 1987 to 1990 Chevy Celebrity engines use distributorless ignition. Timing is controlled by the engine control module in conjunction with the ignition module. There is no provision for adjustment.
The heater core in a 1987 Chevy Celebrity is in the heater plenum to the right of the hump and below the glove compartment.
Timing on a 1987 thru 1990 Chevy Celebrity 2.8/3.1 engine is controlled by the ignition control module along with the engine control module. There is no provision or specification for manually adjusting the timing on these distributor-less models.