99 Tahoe idles ruff sputters and bogs !!! HELP

[surfnobc2]

i listened closely today to my fuel pump . since its very loud and whiney ... after driving it for awhile i could hear it making a noise like it was fading in and out??? does this mean its on the way out ..

[HC2000]

Young man, you should respect the advice from the moderator and the advisor, as they are volunteers giving their time here. You seem to be ignoring their advice as well as their questions to you.

[envoyxuv]

Originally Posted by surfnobc2

I just got my plugs put in about a month ago ... im still wandering if maybe one of the plugs is bad .. this freakin sucks ... it runs fine with air off ... not so good and great loss of power with air on ... whats the DEAL !!!! ... could turning on the air be messing with electrical things (fuel pump ) i can pull a trailer with a full load and it never sputter but when i turn the air on .. its sucks !!!!

so i mean maybe its not the plugs .. but there is still a rough idle regardless all the time ...

It should be noted (again) that the fuel pressure is checked with the ignition on, engine off, fuel pump running. That's when you need to see 60-66 psi fuel pressure.

It also seems that with all the diagnostic advice being posted on this thread, you aren't trying any of it. You should try to focus on the diagnostics of it, not what it could or couldn't be.

[maxwedge]

I think we have gone as far as we can here. If any addt'l info is incoming start a new thread, the message from all our participants is clear.