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Senior Member
Join Date: Jun 2000
Location: N. Phoenix AZ USA
Posts: 28,977
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Spitting through the stacks usually means that its lean. Try richening the idle circuits a bit or check to make sure that the idle jets are totally clean.
It goes to a different circuit from idle to main as engine speed increases and the idle still works with the main circuit even up to the speeds you are talking about.
The reason it does not pop at full throttle is that the acc pumps are shooting raw fuel into the stacks and its mixture is ok.
JoeA
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2021 Subaru Legacy, 2002 Dodge Ram 2500 Cummins (the workhorse), 1992 Jaguar XJ S-3 V-12 VDP (one of only 100 examples made), 1969 Jaguar XJ (been in the family since new), 1985 911 Targa backdated to 1973 RS specs with a 3.6 shoehorned in the back, 1959 Austin Healey Sprite (former SCCA H-Prod), 1995 BMW R1100RSL, 1971 & '72 BMW R75/5 "Toaster," Ural Tourist w/sidecar, 1949 Aeronca Sedan / QB
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