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[non-roc]: mixture in '91 jetta gl?



a friend of mine failed his emissions (hc and co) in a 91 jetta gl. i told him i'd give him a quick tune up. i assume this is digifant ii, like the 91 cab? bentley says to set the mixture you need a co meter. any easier way to do this, like using a dwell or something? i assume it's running rich, right? any shade tree ways to set it, like the back-it-off-till-it-stumbles-then-turn-it-the-other-way trick? reply off list if you'd like. tia,
-michael