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Lynn,
I did it all! Power valve up (9.5), down (4.5),& Standard (6.5).
Rear throttle plates closed, cracked (squared) &open.
Paper clips in fuel metering circuits (different sizes).
Timing lower (10), higher (16), & Normal?(12).
idles find at 850, vacuum 14-15. Eyes burn though(rich?). Lean idle and the stumble is horriable.
The carb just has trouble going from idle circuit to main circuit as you stated eariler.
I have a Speed Demon on my Vette and it is a marriage made in heaven. Idle set with a vacuum gauge was at 13.97, only 3 hundreths off when we checked it with the o2 senser will doing a Chassis Dyno Run. Throttle response is smooth as silk. One jet change up on seconderies and tuning was done( street car tune).
Hopefully I can get the same results in the Cobra.
Bud
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