1: Does temperature and humidity play a role in the issue?
a: If yes, is there a heat shield between the carb and the intake (1/8" is all that is needed)?
b: If no, has the pickup sock in the fuel tank, or the fuel tank itself been cleaned out?
2: What type of ignition setup does your car have (IE: is there a round, oblong coil under the hood, or a MSD style box in the engine compartment)?
a: Round/oblong coil, replace, simple, easy, inexpensive, and a do it yourself type of job.
CLICK HERE for picture
b: MSD style, what is the manufacturer and part number
CLICK HERE for picture
3: Sticking with an ignition issue, and the type of ignition, do you have a Ford Duraspark box in the engine compartment (
CLICK HERE for picture).
A picture of your setup and/or engine compartment will go a long way to further assisting you in wringing out the bugs.
Bill S.