have been trying to improve the idle on the car, so have tried everything on this forum ( and beyond)
checked sparks checked points gap fiddled with the mixture knobs to about 2.5 turns checked for vacuum leaks checked float levels
then, went and got one of those fancy all in one timing lights ( my tacho is in repair at howard's instruments)
,,, and then was surprised that the dwell is sittng at 30 degrees at 750 RPM. FSM says 17 deg ,as far as I can tell
i actually found 3 settings
7 ( in FSM), 17 ( supplement) and 5 i(n owners manual below)
http://xenonzcar.com/s30/files/Owners%20Manuals/1970%20240z%20ownersmanual.pdf
so I rotated the distributor counter clockwise ( vac off) till its about 17, went for a drive and it's lost at least 30% off the top end power, accompanied by a bit of backfire
idle is not great either
what haven't i checked ?