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When I was having problems a few weeks back (acceleration hesitation) I bought an adjustable vacuum advance from NAPA for an 86 CJ, 258, stock distributor. It took a couple days on special order. It came with a very specific set of instructions, and it was very easy to fine tune the advance (once I got the proper vac line from the carb, thanks much to RRich).
Joe

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I will have to try NAPA when I get back from the weekend....thanks for the info.