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 ignition module is located in the distributor, under the distributor cap.
The timing on a 1987 Chevy Celebrity is controlled by the engine control module, there is no provision for adjustment.
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.
Where is the ignition control module on a 1987 nissan 300zx
Timing on a 1987 Celebrity is controlled by the engine control module, computer. There is no provision for adjustment.
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 1987 Chevy Celebrity has distributor less ignition. The timing is controlled by the engine control module and there is no provision for adjustment.
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.
"Powertrain Control Module".
In a 1987 Chevy 350 fuel-injected engine, the ignition control module is typically located on the distributor. It is mounted on the side of the distributor housing, secured by screws. To access it, you may need to remove any surrounding components for better visibility and workspace. Always consult the vehicle's service manual for specific details related to your model.
under the coil