One thing that can cause this is if the trigger/stator air gap in the ignition distributor is improperly set. This is kind of rare, though. You should be able to do a search to find more info on this. The appropriate gap setting is in the service manual, and can be checked with a feeler gauge. Matt #1604 --- In dmcnews@xxxxxxxxxxxxxxx, "Ryan Wright" <ryanpwright@...> wrote: > > Short story: My tach has recently started "twitching". It seems worse > above 3000rpm. Doesn't matter if I'm moving or stationary. The tach > will move up ~300rpm briefly, then drop back down. No change in the > engine, it seems related to instrumentation (though I don't think it's > the tach itself; the twitch is present all the way back at the idle > controller, so unless the tach is feeding back on the signal from the > coil, I'd guess this problem is with the coil, idle controller, or > something else on the line). > > Any ideas? > > > --- > > Long story: A few months ago I replaced my stock alternator with a > 180amp unit in preparation of participating in a parade. There was > nothing wrong with my stock Motorola, I was just tired of the lights > dimming at stop signs (especally with the A/C running). The new > alternator did fine on my 2 hour trip, but died completely after I was > there. Shop that sold it to me said the regulator blew (and tried to > blame it on me, but that's another story). To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/