I have a 93 s10 blazer 4.3 Vin W. Started hesitating last week while driving. Acted as though it was about to die several times. I have good strong fuel pressure and plenty of spark at the coil and plugs but it still won't start. Could this possibly be the ECM?

 

define good strong fuel pressure.

 

It's about 64 per my pressure tester

 

Believe it or not, I would check the EGR valve. I had a 95 and a friend had a 94 S10 4.3L that kept gumming up the EGR. That would make the engine to almost stall when idling.

 

How long does it take for the 64psi fuel pressure to leak down? 64 is a bit high, 60-62psi is normal.
Is it throwing any check engine codes?

 

I finally got it running. I removed the DVD valve, cleaned it, and replaced the old gasket with one that had a screen. I also replaced the fuel pump, fuel filter, plugs, plug wires, distributor cap, rotor, ECM, the fuel pressure regulator, and finally the spider injectors. After I replaced the spider I have had no problem whatsoever. Ugh, I hate this gm design.