[Snip]
> Wow, it's the day for mystery problems just like mine! I have the same
>thing, but
> at ~73 mph (~4200 rpm), only in fourth and only after about 10 minutes
>driving that
> speed. It also seems to go away from time to time. Of course, I generally
>don't
> drive for ten minutes at 4200 except on the highway in fourth...
> The problem seems to be fuel-related in my case. If I slow down by 10 mph
>and
> drive for a few minutes, I can speed back up again for a while. Then it
>happens
> again a few minutes later.
> There are no strange noises. It's not suspension or brake related. I have
>pulled
> over and checked the coil - it's warm but not hot >>
I have had a problem that was very similiar to this, although I have twin SU's,
so it may be different. But anyway, my '73 Spit MkIV developed a missfire at
high(ish) rev's, which I couldn't track down for ages, eventually, whilst
looking in the carb throats with the filters off, I noticed that the front
carb's damper was rising at a different rate to the rear one's when I revved
the engine, I then noticed that the front carb's throttle spindle had worn
ito the body of the carb causing a 'big' air leak, so I changed the carb body
and the problem disappeared.
Rich
Northampton
England.
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