It doesn't sound likely but, could the egr switch influence the ignition.
I know I'm reaching for straws here but I don't want to fork out cash for an ignition module (Hall effect device) unless absolutely necessary.
Will a distributor from a 1.6 fit the 1.3 engine?
I have one of these from a sidekick engine that I plan on rebuilding and putting into one of my samurais.
I've got an 86 that I run, an 87 parts unit, a 91 that I'm working on and a 70 something lj 10 that I'll put a geo metro 3 cylinder into at some point.
It's the 91 with fuel injection that confuses me.