most likely ,you just need to reolace the coil
Usually misfires can be attributed to a bad plug, wire or coil.
I have replaced the coil and distributor cap.
the coil is behind the motor
Bad coil pack?
yes front coil springs with front shocks on a 1987 cadillac brougham rear wheel drive
Heater coil
Replace the ignition control module
There is no such thing as a coil relay.
Click the link.
On the distributor cap
Bad coil? Bad distributor cap? Bad distributor rotor?
behind the drivers side head