Need help with the Z71 again, guys

[Nick The Great]

Has anyone said fuel pump yet?

Her Impala was acting like that (it wouldn't run for more than a second). It would eventually stay running, but it was the fuel pump acting weird.

 

[thunderstruck]

Is the check engine light on?

Good question. When my pump went, I got code 44, "Oxygen sensor voltage was under 0.2 volts for 50 seconds of closed loop operation. (Lean Exhaust Indicated)"

If it runs with your foot into it I dont think its the pump, they either work or they don't.( at least in my experiences) Air idle contol or map sensors F up in TBI's easily enough and are cheaper than fuel pumps.
I know my 98 Dakota we had to idle up to 2500RPM to keep from stalling/lopping hard, changed both AIC & Map sensor and it ran fine.

I have had a couple exhibit this exact problem, and it be the pump.

In fact, my Tahoe JUST did this. It would idle. Give it gas, and it blubbered and died.

I had a '91 do the exact same thing, and you could give it just a little more throttle.

You are correct, 95% just don't start at all, but some do act like this when the pump fails

Agreed. My 95 also had similar symptoms when the pump went out about 4k miles ago. http://www.truckmodcentral.com/forums/showthread.php?t=9834

 

[buckshot85]

Is the check engine light on?

it's been on since i got it with all the jimmy rigs wiring no cats and crap

 

[OldCracker29]

Is the check engine light on?

it's been on since i got it with all the jimmy rigs wiring no cats and crap

That doesn't help much then. If it's not the fuel pump, especially with everything else you've done, the computer might be on it's last leg.