Sometimes too much spark advance can cause a rough running at 2-3 thousand rpm with no load. Try disconnecting the vacuum advance & see if it still does it. You may have to change the vacuum advance chamber or put a limiter on it or set the timing back a little.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
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