Absolutely no difference in mixture is achieved in mixture adjustment until one has overwhelmed the system. The mixture is self correcting. The only thing one can do is center the ability of the system to correct rich and lean. If one goes beyond the systems ability to correct it will run like a POS and get terrible mileage. The system is easy to adjust if you know what you are doing but once in control, what you get is what you got, idle wise. If it is poor then general mixture isn't the answer.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician