5A-F Not Starting...Ignition Module Perhaps?

[TZ2590]

Evening All.

My JDM Sprinter with a 5A-F engine started acting up lately.
Was running quite well until the other day when suddenly started running incredibly rough including (but not limited to) low (600-800rpm) idle, missing under load, lurching (badly) & sometimes stalling when idle.

Now will not start whatsoever. Engine turns over but no joy.

Someone suggested perhaps the Ignition Module...know nothing about Ignition Modules so can't comment. Otherwise I thought maybe the Ignition Coil?

Spark Plugs: Replaced recently
Ignition Leads: Seem to be reading correct resistance. In good nick.
Distributor Cap: Replaced original recently.
Rotor Arm: Replaced at same time as Distributor Cap.
Battery: Hydro Eye reads 80%+ charge. Near new.

So all that remains really is the Coil/Ignition Module assembly.

Any thoughts or suggestions are greatly appreciated.

[90 GP]

Verify that the timing belt is still intact. Remove distributor cap and start engine while someone else looks to see if rotor is turning. Also check the resistance (ohms) readings of the coil. Refer to a service manual for specs and procedure to check it.