take it to dealer
If you do not have any problems with plugs, change them when you replace the timing belt (do not forget to replace the spark plug wires too).
You should never need to replace the wires leading to the spark plugs. The 2003 Miata has a coil pack at each spark plug (inside the spark plug hole). The wires leading to the coils are low voltage and should never break down.
Broken spark plug wires will keep almost any car from starting.
The Toyota echo does not have wires or a rotor, each spark plug has its own ignition coil (coil pack). So really, all you can do is change the spark plugs.
How do I change spark plugs on Toyota rav 4 2003
i have an 03 aztek. i change plugs myself, i have skinny arms to reach from underneath the car.
What is the firing order of a 2003 or cruiser
At the end of the plug wires that don't connect to the spark module.
spark plugs and wires
with a 10mm socket remove the two ignition coils and the two spark plug wires, using a 5/8 spark plug socket and one long extension and a ratchet remove the spark plugs and install the new ones
at the end of the plug wires
There is no distributor on it. There is a coil pack, you can follow the spark plug wires to it.