Hey man, I am having the same issue as you with my '97. Basically OBD II uses for 4 digits in the code so the code 93 you're getting is actually code 0903, which is the evap control valve. I have been trying to figure out a way to solve this other than removing the whole damn emmisions system. The valve is behind the rear passenger wheel and can be replaced for around 60$, another cause can also be the fuel cap. I haven't tried replacing either one, i have seen people replace one or both of these parts only to have the light come back a month or so later. So until i can find a more definite solution i have just been resetting it when it decides to show up.
Were you able to fix yours?
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