Jerking topkick gmc c5500

GMC guy

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#1
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Gmc
C5500
2005
204000
6.6 duramax


Hi dudes! Im posting here because the heavy truck area does not respond. So i am hoping someone knows about heavy trucks here.

Truck shifts okay from 1-2nd gear but once i get to drive and overdrive the truck jerks and doesnt shift until i let up on the pedal a bit. Only then it shifts. If i keep my foot on pedal or add more pedal, it just chokes out and will die out until i let go the pedal a bit. I know the tranny is good. I got some egr codes. One says egr low flow. Would an egr cause this?
 
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#2
I would suggest that you disable the EGR temporarily by removing a vacuum line (and plug it) or disconnect the wires if it is an electrically actuated design, and test drive to see if it runs and shifts differently.
 

GMC guy

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#5
Okay, i took it apart. The egr has been deleted. That explains the egr codes. The air filter is also very plugged.