Truck randomly doesn't want to start, will later.

[fixkick]

Plenty of spark on all 4 plug wires, checked with screwdriver arced off metal on engine.

I took intake runner tube off, the injector is clearly pumping gas when trying to start.

Brand new fuel pump, etc.

I have spark, I have fuel, just randomly decides it won't start after being shut off.

the engine will not START NOW, and spark tests good
if the engine run now, spark need not be checked,.... obvious but must be asked.
engine dead.
spark tests good
then you lost fueling take off the big air horn pipe, its just a pipe, there is no MAF sensor on this engine (until 1992 , first one in usa 16v)
look at it inject, with 2 persons, one looks and other cranks , use mirror so if it back fires, no burned eyebrows.
or crank and use camera to photo it injection even make a movie, then watch the movie, safe in bed.

the tests are so easy on this engine, spark then fuel.
if spark dies, the ECU sees spark die, then cuts fuel so car does not do kinda like " crash an burn thing as seen on TV." (by law)
if cmp dies, same thing no spark, and logic above, no fuel.
if spark is ok, fueling must happen. does it"?