OK so here's what's happening. My 7.3 IDI turbo rpm wonder's at idle and is really jerky at low rpm like 800 to 1900 rpm range but when I unplug the back wire on the IP it stops and runs fine. So what's that wire do?
PS. It's a 1982 f100 with a 7.3 IDI turbo with zf5 speed and 2.75 rear
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