Dave---I would be curious to know if the engine performs well (without the
hesitation off-idle) when the car is closer to sea level.
In any case, you could advance the spark timing to see if this helps, as
driving at high altitude allows for more timing without pinging. Try 14 deg.
BTDC at idle. No vacuum connected during this setting, and idle speed slowed to
900 rpm or lower.
Thicker dashpot oil will slow down the raising of the needles coming off idle,
for less stumble.
You could also turn down the jets a couple of flats or more, and do a test
drive. If it makes the hesitation more pronounced, go the other way with this
adjustment.
Needles slimmer, just off the idle stage, are available. If you don't have the
SU needle selection book, let me know the number that's stamped on you needles,
and I'll look up something that could help. Try the above suggestions first,
though. It's cheaper, and quicker!
Dick
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