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    High RPM "stumble"

    My car has been acting up lately. Whenever I go WOT and shift from 1st to 2nd and 2nd to 3rd the car "stutters" at around 4500-5000 RPM. It did it with the factory tune...and does it even more with a new tune from RWTD. My question is...Is this spark blowout? I've got the factory plugs...
  2. S

    Xylene

    Just wondering if anyone uses it? I used to mix my own "home brew" 100 octane for my Turbo Buick by mixing 4 gallons of Xylene and 3 ozs. of Marvel Mystery Oil to 3/4 of a tank(12 gallons) of 94. I thought that a gallon added to a full tank of 94 in my Cobra might be a good preventative...

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