I would look at a fuel delivery problem.
Sounds like at full throttle your engine is using fuel just a bit faster
than it is being delivered from the pump. Leave your foot to the floor and
you basically run out of gas.
Take your foot off the gas, and the float bowels fill back up and you are
good for a while.
Check your float settings and you fuel delivery rate.
Might be time for a new fuel filter.
Rick
On Mon, Jan 10, 2011 at 7:36 PM, Douglas McKinnie <d.mckinnie at usa.net>wrote:
> Of the twin SU variety.
> I haven't had much occasion in recent years to take this car on the
> interstate
> highway. At first this morning all was fine, but then I noticed in the East
> TN
> long uphill stretches that the more I pressed the accelerator pedal the
> slower
> I seemed to go. At times I could only maintain a speed of about 50 MPH,
> which
> as it turned out was fine because I was pacing the large trucks that were
> no
> faster. If I let off the pedal a bit, that seemed to give the engine a bit
> more energy, but not enough to increase the speed at all.
>
> Eventually I discovered that if I let up the pedal fully and then pushed
> down
> again I would get the full power that I was used to, but it would
> eventually
> bog down again. By pulsing the pedal off every so often I was able to keep
> up
> with any traffic I wanted to keep up with, even on the long steep uphills.
>
> This made the last 200 miles of my journey tolerable, but obviously this is
> something I want to fix. And I suspect that some of you who have a better
> understanding of the mechanics of the fuel system than I do might know
> offhand
> what would cause this sort of behavior.
>
> Douglas
> '70 MGB-GT
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