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1969 Ford Mustang Grande with a 351W, Holley 3160 vaccum secondaries,
headers - otherwise stock motor.
The carbuerator was just rebuilt, accelerator pump is new, power valve is
new, timing is correct along with dwell. Good strong fuel squirt when
throttle is opened.
Here is the problem: On initial acceleration under load (in other words
when driving the car normally), the car stumbles. If you 'feather' the gas
pedal, it will lean backfire sometimes. It will even stall occaisionally.
After the initial stumble, the engine runs fine.
This problem is barely noticiable under acceleration in park. There is a
slight stumble, but nothing to write home about.
Smooth acceleration in park shows no stumble. Very gentle acceleration
under load shows no stumble.
If the throttle is opened wide and hard during normal driving, say like
passing, there is no stumble and the engine runs strong.
Any thoughts?????
jhs130
Pull a spark plug from one of the rear cylinders - 7 or 8 - and check if
they have a lot of carbon on them. I had this happen before and the carbon
on the electrodes would cause the same symptoms.
67Coronet383
Those symptoms sounded like the same with my car, just pulled #8, and it
was loaded with carbon, they are really old plugs anyway so I'm going to
pick up a new set.
thanks 67Coronet383.:thumbs:
azkid110
