I think Stu is on the right track, especially if the tach reading drops
when the
"bump" occurs. Having experienced the same sort of thing with a Renault
(I know, I know - what was I thinking) several years back, I would carefully
check that any ground connections are intact. Due to the many small
movements of the engine and gearbox as a vehicle moves down the road,
a ground connection can easily be broken momentarily resulting in just
what you have been observing. Took me about two years to track down
the problem in the Renault - the ground was a small wire screwed to the
engine block, not a big strap like the Tiger. And to think Ampere, Biot and
Savart were all French!
Regards,
Tod
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