92 Plymouth Colt Vista 2.4L intermittent no start?

[Harvardman]

92 Plymouth Colt Vista with a 2.4 non turbo fwd automatic that has been in the family since new. Has 100,000 km. It has recently developed an intermittent no start condition. I don't have and can't find an old school scanner that has the correct cable to connect to the car. Hard time finding any diagnostic material for this car. I believe it's a no spark issue but the problem is that everytime I go to look at it the car starts.

Any thoughts? Would appreciate any help. Thanks in advance.