Ok well this normally works if you can't find a certain car then get a car that is in the same calss as the car you want and when you drive around cars will appear in the same class. So for you, the Phoenix is in the Muscle Car Class so you can drive the following cars to make the Phoenix appear on the road (Buffalo, Clover Or Sabre) I normally do this and end up finding the car I want realy quickly, sometimes you may have to drive around in different parts of the island for awhile but it will appear sooner or later.
Hope this helps.
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