only idling
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Neither of these codes exist according to my go-to code sheet... are you sure about those? But even if you cleared the 1688, that's mechanical pump failure code, you can't just clear that one. It will come back, and that would also explain your hard starting issue (edit: WHEN WARM). My friend, you need a vp44.
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98suburbandiesel6.5l
Chevy/GMC 6.2L and 6.5L
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07-25-2015 03:25 PM