05 Tahoe has loss of torque

[CookieMonster401]

There's many things this could be. If it were mine, I'd like to know the fuel pressure when this happens and I'd fix that knock sensor before spending money on anything else.

Ive been sitting on new knock sensors for a while since I gotta remove the entire intake manifold, but I'm getting under there this week I'm gonna set myself up for some new sensors too. Do I need a new manifold gasket?

 

[swathdiver]

Ive been sitting on new knock sensors for a while since I gotta remove the entire intake manifold, but I'm getting under there this week I'm gonna set myself up for some new sensors too. Do I need a new manifold gasket?

Absolutely.

 

[cam3439]

Also look up the recommended sealing of the knock sensors with gasket maker. It’s hard to see in the photo above, but I sealed the entire top of that knock sensor grommet/hole. Water gets down into those holes and corrode the knock sensors due to poor or old grommets. Replace both sensors while you’re in there.

Also, if the corrosion is bad enough, you may need to replace the knock sensor harness, so keep that in mind.