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350 Chevy in a boat. Worked with Howell EFI to program the chip as they have done several boats.
Facts:
Timing set to 0 with wire disconnected. There is only 1 vacuum which goes to PCV. Other valve cover is plugged. All other small vacuum lines off throttle body are plugged. Even plugged PCV and still had shaky idle. I will look for anything else tomorrow.
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