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    1994 Cadillac Seville STS EGR valve problem?

    My 94 Cadillac Seville STS started running sluggish and rough idle after using three tanks of 87 Octane gasoline. I changed back to Premium and it's a little better but still idles a little fast and rough when stopped and in gear (at red light etc). I figured maybe a tuneup would solve the...
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    STS vs SLS

    Is there a big difference in the gas mileage of an STS vs. an SLS version of the Seville?
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    STS questions...

    STS question... What kind of mods do people do to these? Can you improve the suspension to make it have an even BETTER ride? I know of a guy locally that puts superchargers on Northstars, so suspension is my real question.
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