[Opeler2]

First I hope I don't get in trouble for posting in the wrong area. "Can you find it in your heart to forgive me."

It seems that my 73 GT does not like to idle under heavy electrical load. Basically if I roll the headlights she will stall only at idle. History

Charging system: stock
Ignition system: use's petronix ignitor and bosch platinum plugs all else stock
Fuel system: stock
Charging system delivers 13.75 volts at idle climbs to 14.25 at around 2500 rpm
Engine timing is correct but hard to verify with the location of the *(#$^ timing mark.
Can the timing being to far advanced or retarded cause this issue.
Its very annoying

 

[Opeler2]

Vacuum

O.k Idle speed set at 850
are you saying that i'm not getting enough advance on the dist or to much

 

[Opeler2]

Flicker

This is alot of ground to cover. The battery is not new but holds a charge well I suppose it could be going south but I've had no starting problems. car fires right up even when cold choke operates correctly.

Idle speed was set using the tach in the car.
Distributor is new/rebuilt as is the vacuum advance can.
the lights do not flicker when turned on or when the engine dies they are bright and do not appear to dim other than the drop in voltage when the engine dies and the battery takes over.
I adjusted the timing and carb a little and the car would idle with the lights up
I just got back from a drive in the dark and it seems I may have misdiagnosed this whole problem I now notice that the engine will die when engine is at idle head lights are on and brake pedal is depressed. which I think points to a bad brake booster.