Don't you need a spacer that goes into the fuel bowl to keep fuel from sloshing around in the bowl when off-roading? That may be your problem. You're starving your engine of fuel because fuel is running away from the needle. Just a guess. Your q-jet probably has one....
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'69 3/4 ton C20 2wd-350ci/TH400
'69 3/4 ton Custom 20 2wd-350ci/4sp Manual
'99 2wd 5.7 Chevy Tahoe
Seattle, WA.
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