Picture of Igniter above ^^^^^^
On the early SR20DET the ignition system utilized coil on plug individual coil packs and the use of an Ignition module which works to control the voltage each coil pack receives when commanded to fire by the ECU.
Whilst it is now certainly an out dated way of handling the ignition system it still does perform well in applications up to and above 300HP.
The stock location for the igniter is on the passenger side (Left Side) front strut tower within the engine bay.
Picture of igniter position in good condition to go above ^^^^
Now this was perhaps not the most wise as it is located directly next to the turbo, now with the stock heat shielding on the exhaust manifold, turbo and dump pipe this position is indeed fine in normal conditions however it does not withstand the temperatures reached on a track day or repeated hard driving.
This results in what you see above, the plastic of the igniter has melted and in this case it caused damage to the internal circuit causing significant misfire. If you are experiencing a misfire inspecting your igniter for this damage should be your first step.
In order to mitigate the potential damage to your igniter constructing a heat shield over the igniter is strongly suggested, you can also relocate the igniter to behind the strut tower which works exceptionally well however it requires you to extend the loom or reroute the loom through the chassis.
HOW TO TEST IGNITER: