Mine, too, sputters at a constant 2000-2500 rpms. It was always wimpy
around that range and then I installed a better flowing muffler. Then it
got really wimpy. Then I cleaned out and rebuilt my carbs with a few Viz
mods. Now it really sputters 2-2500. I found I could get rid of the
missing if I turn my mixture nuts two flats richer. It surges a little at
idle now but runs pretty smoothly everywhere else. Seems not to like cool
temperatures, though. I may try some MGB HS4 'red' piston return springs to
keep it a little richer down low. If I do, I'll let you know.
Shawn Tobin
'69 Midget 5spd daily driver
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