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The reason it’s worse at idle is due to variable AFR due to change in air-flow volumes at idle versus high-RPM/WOT. Without needle-jets in place, idle AFR is way too rich given full-flow from emulsion tube. With more air-flow, this large amount of fuel isn’t as overwhelming, so it appears to run better. But is still too rich. Less bad is still not good or perfect.
Yeah, shops all suck at working on carbs. Mine sat at shop for 3-days before they called me asking how to plug in OBD-scanner!
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