Loss of power during acceleration. Please help!

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Feb 16, 2025 | 5:01 PM

#21

Rottenmiller

CF Beginner

Joined: Sep 2024

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From: Troy PA

Quote:

Originally Posted by 09silverado6468

Hey y'all. Please help! Been trying to get this thing to run right for a long time now. I googled it but got mixed answers. On a 2009 Silverado, will an exhaust manifold leak cause it to struggle while accelerating? You can feel it cutting out and trying to open up. Wondering if it will throw off the air/fuel ratio. It also has a long start a lot of times and runs rough for a few seconds then idles correctly. I do also have an evap leak too and have replaced most parts for that, would either of these cause this?

I had the same problem with my 03 Silverado hd 6.0. There is a vacuum nipple below and to the right of the purge valve. I recently had work done and the hose was disconnected, so I connected it. At half throttle it would lose power and like shudder a little bit. I unhooked the hose and the truck runs good again. I don’t know what the part is that the nipple is connected to, I would like to figure it out so I can replace what needs to be replaced and plug the hose back in