would a knock sensor on a 91 z28 tpi 305 cause the car to run for 5 min then die and not start??

 

no

but an ignition module would

 

has new ignition mod. and dist.

 

What's the fuel pressure while it's screwing up? What does the tach read while you're cranking it when it's screwing up?

 

Check the three basics, fuel, air, and spark.

 

fuel pressure is around 43 psi,,has spark,,air flow is good havent checked tach to see what it pos. it is at yet

 

So, it's at 43 psi WHILE IT'S SCREWING UP as opposed to when it's working right; and it "has spark" WHILE IT'S SCREWING UP as opposed to when it's working right; and these sparks are nice big fat snappy purple-white ones at least 1/16" in diameter, not little faint weak yellow-blue ones that are hardly bigger than a hair, WHILE IT'S SCREWING UP as opposed to when it's working right; and we know FOR SURE that #1 has spark AT THE SPARK PLUG when it's at #1 firing?

Did you do all these checks WHILE IT'S SCREWING UP as opposed to WHEN IT'S WORKING RIGHT?

 

you need to make sure that the heat compund was put on the new ignition module.