I've been chasing an interment loss of performance in my engine all summer. I finally noted that voltage was dropping way down to 11.2 when it would occur but the engine would still fire no problem. Had to be corrosion and I looked every where...then by peeling back the cover off the fuel pump wiring harness I discovered one of the tabs was actually cracked and losing connection. I had to actually remove the pins from the connector to find it but won in the end...BTW I couldn't find the pins anywhere and finally hit carter's gm NV, the shop foreman was super helpful and dug through tray after tray them boom, found em!
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