258 High Idle, Hard to Shut Off

vendredi 23 mai 2014

Another weekend, another problem.

Been driving beautifully, now out of the blue it has a high idle problem. It started while I was driving around town, was already warmed up.

258 w/ Offy intake and Holley 4bbl carb with electric choke.



I have tried turning down the idle screw, unplugging the electric choke and the vacuum advance to no avail.



It idles at roughly 2k and is hard to shut off, it diesels for a few cranks before finally dying.



Could it have something to do with the ignition control module or idle control box (in a previous thread I might have an undiagnosed ignition control module problem)?



Some pics for reference:













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