[oldeerslayer]

And I can see the injectors spitting fuel even when it's not starting.

Been a while since I've worked on a TBI, but that doesn't sound right. Could be flooding itself.
Next time it wont start pull a plug and see if it's wet. It should not be.
Have you pulled a plug wire and held it near a ground to see if you're getting spark when it won't start. Should be blue/white and snap audibly. I hold the wire with a pair of pliers I fitted with some heater hose so as not to get zapped. At my age that might stop my heart. Or find a dumb neighbor hood kid to hold it.