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Re: Rough Running Dually
You might. I would simply pull the vacuum line off and plug. Start it and see what happens. Also you should be able to manually operate the EGR to see how s operation is. Also along that line, you can check the EGR control.
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72 GMC C2500 402/Th400 first truck (still have)
77 GMC C3500 CC dually Sold 
70 C50 dump truck "Rusty"
87 K10 Suburban Sold
93 K2500 xcab 6.5TD
96 GMC K2500 Suburban 6.5 TD
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