Amp meter fluctuation?

Unless your regulator has been changed, you still have the old points type voltage regulator. They are a coil and a set of points and work by turning on and turning off the alternator. Yes the amp gauge will fluctuate at idle and especially with the turn signals on. You should be able to see the needle move each time the flasher flashes. It is remotely possible that low voltage is causing a engine miss but not very likely. An engine miss will aggravate the amp needle jumping though. Without seeing it for myself, I would say it's a normal thing. tmm