Ya it seems to be one of two things, or a combination of both: one setting the other off.
From the top the 12HT where the throttle cable transitions to hard linkage, there are a lot of linkage points to the final connection spot at the fuel lever.
The DI engines seem to have a lot of snot right from the bottom. There does not seem to be as much turbo lag as with their turbo IDI brethren...power is smooth all the way up.
Put a lot of snot from the get go together with multiple linkages...bouncing/jerky/harmonics have creation potential. I’ve not tried to see if all those linkages can be firmed up.
The 12HT loves to bounce off the bottom governor too, it seems. Adjusting the idle up juuuust a tad can assist if this is part it.
Anyway...as many have said...nothing that can not be learned about and worked with..as the engine is nothing but stellar imo.
hth's
gb
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