'91 S10 Blazer, 4.1 4x4 @ 234,000~ miles

Issue: I start it, it tries to stay alive, until it dies. does this a lot. backfires here and there.
If I keep trying and keep pumping gas into it, she'll will eventually run flawlessly which is confusing.

Have had this issue for many months. It has only got much worse recently.

have tried: a new fuel filter, air filter, IAC valve, general tune-up
I keep looking around this forum for other ideas, but nothing really seems to working

we're clueless, help please

 

you have a 4.3 not a 4.1.

Remove and clean the egr valve. its behind the throttle body,little black round thing. you need to remove the tbi unit to get it out,clean it with brake cleaner and reinstall.

 

Yes, 4.3, sorry.

I will look into this, thank you.

 

Cleaned it up, no help.
We also cleaned the throttle body a little, but no dice either.

 

any codes ?

 

I believe 42 came up;

 

One of the great things I've found in over twenty years of working on EFI systems is that the ECM is in fact the last thing to suspect.

active module then wiring, followed by sensor.

 

This, right?

Also, tried to check for codes again a few times, and only code 12 comes up now.

 

We ended up pulling the gas tank and replacing the Fuel Pump.

She seems to work great now

 

good to hear thanks for telling us you fixed it =)