I have replaced many injector driver modules on these diesels. GM has redesigned it and i have never had a replacement one fail. This is a known problem for the 6.5 diesel. Unfortunately its about a 500 dollar part from the dealer, and requires intake removal, and some very tight work space to replace.
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Cheepest thing is the fuel filter replace it if it has very many miles on it next test fuel rail pressure with a tester from renting from one of the auto parts stores. turn key on with gage connected and see what the pressure reading is then turn key off does the pressure hold for 60 seconds? if yes then pump is good if not pump is defective. If it has two tanks check switching valve to see oif it issticking open
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My truck will a stall out while driving and then after a while of sitting it will start again
Bad egg smell also
My truck will a stall out while driving and then after a while of sitting it will start again
Bad egg smell also could it be the cadalick
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