88 k5 pos blazer 350 tbi no run

[posk5blazer]

Thanks for viewing. I have an 88 k5 blazer 4wd A/T 350 TBI. Rebuilt motor with 170psi all around. Just fired it, ran like new for 45mins, all of sudden stopped running after I shut it off once refired it shut it off 2nd time and then didnt run. Fuel pressure good, ecm communicating and reading everything in the normal range, new cheap dizzy, new good wires, plugs, cap, rotor, ign coil. I am confused. vacuum lines all cleaned and like new, no cracks. 12 volts at coil with ign on, 10.5 while cranking. Very weak spark, sprayed either still wouldnt even cough. Maybe ESC?? both coolant temp, knock, oil pressure swx all replaced. Haha im lost any suggestions on what else to check????? Thanks

 

[496truck]

ignition module in the distributor?

 

[bot0611]

new cheap dizzy

Theres your problem...
Check the dizzy.

 

[posk5blazer]

Thats what I was thinking. i switched ign module for my factory gm one, nothing. Thanks I'll try and find a known good dizzy and throw it in and see what happens. Keep you posted!

 

[4X4HIGH]

If you have spark but it's weak then I would be looking at a bad coil even though you said it's new.