One simple thing to check is the fuel filter. The condition of
your plugs sounds as if you are running rich but since this semms to have
just started without warning I would look at the filter.
On Thu, 2 Apr 1998, ROBRTM3 wrote:
> Dear List,
> Have developed a problem. Recently my 77 mgb has started to misfire or
> "cough" at acceleration above 2500-3000 rpm in 3rd and 4th gear; performance
> improves when backing off, runs smooth at lower rpm and of course lower mph.
> I am somewhat a novice and learning, but I have checked the plugs and they
> seemed dirty with black dry soot deposits, cleaned them up a bit, but did not
> have a real improvement.
> Thanks in advance for your ideas and assistance.
> Robert Murray
> Katy, Texas