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It was the lighter of the two centrifugal advance springs that pull the weights back towards the inside of the distributor. It was just strong enough to pull in at about 1600, which would make the idle drop to 400 rpm. I'd boost the idle slightly, and it'd take off again. I actually found it by watching what the timing light showed as I revved the motor. I'd been swearing that it was a vacuum leak... actually, by that time, I was swearing quite a bit. Toby B Steven Ayres wrote: > > TobyB=> My favorite was a weak spring that made the car 'hunt' for idle > => between 1600 and 400 rpm. > > Which spring was that? > > Steven Ayres, Prescott AZ > '66 343 > > ------------------------------------------------------------------- > Search old messages on the Web! Visit http://www.vwtype3.org/list/