[Spits] Weird engine idle

[Clark W. Nicholls]

Ok, good...
How long has the Crane system been in?
Has it run fine for some time with that or is it a new installation?

Does the car run fine for some distance (10-20 miles perhaps) and then start
to die?
If so, when that happens check the temperature of your ignition coil.
If it's too hot to touch, you need a ballast resistor.
Perhaps more info of use here:
http://www.cwnicholls.com/spitfire02a.html
Good luck,
Clark