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my VX has the smoothest idle of any car i've ever owned. i see no change with e-10 or e-15 or whatever crap comes out of the boat and mower at the end of the summer,
my guess is timing, if the timing belt was off a tooth after that rebuild. that would certainly cause a bad idle. or a bad o2 sensor, find someone local and trade o2 sensors for a day or two,
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