01 Tahoe whistling

[tbush]

I have a 2001 Tahoe 5.3 v8. It makes a bad whistling noise at start up and when acclerating, the truck struggle to get to 50mph and won't go above 3k rpm. Also idles rough at a steady 500 rpm. i'm ceartin its not an intake leak as i've sprayed all around with ether. Belts are good. Any help? Thanks

 

[Rigwhore]

I can't help but think vacuum leak

 

[Mechanic421]

Clogged cat.

 

[Mechanic421]

But must test.

 

[Contend997]

Sounds like a vacume leak but if you have a cloged cat or muffler plugged due to cats that would do the same thing

 

[Rocket Man]

I also suspect clogged cat(s). Have them checked for restriction.

 

[rockola1971]

Did Eddie Murphy stick a potato in YOUR tailpipe?

 

[afpj]

It was a banana

 

[tbush]

Sounds like a vacume leak but if you have a cloged cat or muffler plugged due to cats that would do the same thing

wouldnt a vacum leak show up when spraying ether? also how would i find out if its a clogged cat. these trucks have 2 right?

 

[Rocket Man]

I had a mechanic test mine, not sure how it's done but they said my left was 85% restricted and my right was 50%. And yes we have 2. Mine had pretty much the same symptoms as yours except the whistling. Another clue is if it clears up a bit when it's cold but gets bad again as soon as it warms up and plugs again.