I'm old school. If it's gas, look at a plug or two. If they're white, it's lean, if they're brown it's rich. You can google search images for how to read plugs.

If it's lean, look for vac leaks.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.