2000 Blazer 4x4 2Dr SFI

Runs strong for approximately 1 minute... Then bogs down, tries to stay running and quits.

New plugs, wires, distributor, cap, rotor, fuel pump then again with Delco Pump, fuel regulator, fuel pump relay, fuel filter, ignition switch (x2), blinker switch, heater core and thermostat...
Cleaned EGR Valve, Throttle body, Intake and injectors...
Visually inspected all vacuum lines.

Exhaust smells normal, no gas fumes emitting from under the hood or tank.

Fuel Leakdown test 65 psi... it'll stay there all day long...

I'm lost... Don't know which direction to go next.
It backfired before it quit running a few minutes ago, first time that's happened.

 

What brand of cap rotor wires plugs did you use

 

Bosch plugs, whatever autozone brand wires, toughone distributor with cap and rotor. I replaced the cap and rotor, then realising the mount screw was broken, replaced the distributor. I also changed camshaft position sensor. Also came with the distributor.

 

These trucks are fussy about aftermarket parts. The toughone cap and rotor could be the problem. Most everyone here uses ac delco for a reason

 

I do understand that, but correct me if I am wrong... Wouldn't that throw a DTC? There is currently none showing. I do not seem to be misfiring. It runs great... not very long though.

 

runs strong for about a minute?
just about enough time for the ecm to go into closed loop and start looking at the O2 sensors. try unplugging the rear (post cat) O2 sensor first, then the front O2. see if it will keep running.

 

I believe I've located the issue... The air pump/smog pump under the fan housing has a check valve that precedes it. The line going into the pump housing is broken. It was swingin in the breeze down there. Now I've attempted a JB WELD on the plastic housing but it still takes in outside air.
I cannot spend another 500 to get a new one. I've seen some talk about it being unnecessary to the running of the vehicle and can be bypassed... Does anyone maybe have some advice on the matter?