Changed jets today, 104 from 100, same rods, about two steps richer.
let engine warm up, set timming to 13 btdc 750 rpm. Blip throttle a few times to 3000rpm, seemed ok, turn a/c on blip throttle again, as rpms drop goes negative 750rpm, down to almost stalling then comes back up to 750. Blip again, rpms drop to stall. Start up again same procedure, rpms drop, and again almost stall engine, but goes back to 750. As rpms drop close to stalling, amp meter reads negative. Rpm drops to 680-670 in drive and reverse. When a/c is off, tendency of stalling seems to be less, but as car runs longer, tendecy to stall goes up, a/c on or off.