A.I.R system?? -have loss of power… code 43 for knock, and 44 for lean condition????

[scouthead]

If the fuel pressure is low, it will have been adding fuel from the stock table. Disconnecting the battery will put it back. I think the lean condition code indicates that it can't trim any further. A misfire typically reads as rich.

You could try taking the A.I.R. tubes off the manifolds and plugging those holes as a test. IIRC, it's a weird pipe thread and not a standard bolt thread.

Air tubes are attached but the inlet from the pump is capped off at this time - exhaust SMELLS better but truck is running worse than ever currently

 

[scouthead]

You can unscrew the check valves and use an iron pipe cap to seal off.
1st pull the hoses off check valve and see if any exhuast is coming out off the check valve it is not supposed to.

Take a hammer handle and give the egr top a light rap, sometimes helps the pintle seal if carbon is holding it open.

Didn't say if IAC passages was clean ? Did check the TBI base gasket ?

Yeah I’m going to try tapping on EGR. I’ve tried disconnecting and capping vacuum line- doesn’t run any different
EGR appears to open with a vacuum pump and hold vacuum

As for as I can tell the gaskets on the throttle body are good- nothing inside or outside sticking out and no smoke from the smoke machine leaked out there

 

[scouthead]

Soooo out of desperation to get home for the weekend and bring back axle parts of my daily driver to fix…

The blazer was driven 170 miles in its current state.

Started out not horrible- got worse.

Initially taking off from a stop was underpowered but manageable- carefully feed the skinny pedal and slip the clutch.
Once cruising at Hwy speeds it was ok, but Check engine lights on and off throughout the freeway ride. Steady on the gas pedal, but could feel a percentage of the power disappear and then Come back and then disappear again- not always in time with the check engine light going on and off. I think this may have been the knock sensor retarding timing

Someone cut me off in traffic and the engine stalled when I came off the gas and stabbed the clutch.
Once stopped, lots of cranking to get it running again.

Made it home- it stalled as soon as I pulled up to my garage behind my apartment.

Let it cool off and had to run to catch a date- it runs absolutely horrible now.
Bucking- barely idling- chuffing sound coming from exhaust, no power, not sure how many cylinders are firing, shaking, almost impossible to get it started from a stop. Lots of use of my non synchro low gear - lots of grinding trying to force it in gear to avoid stalling.

I felt like a stressed out octopus trying to parallel park while it coughed and sputtered and stalled

Only code that stuck in the memory this time is 44 - that’s knock sensor right??