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A couple of points: These cars hate aftermarket gas caps, period. Secondly, the way that the EVAP system works can allow the car to leak vacuum through the EVAP system itself, with no observable leaks for a smoke test to pick up unless you really know what you are looking for.
Keep running the car and see if the CEL comes back; if it does, you are going to need to start checking each component in the EVAP system to make sure the valves open and close correctly, as well as looking for cracked hoses under the passenger's side front fender. As this is a fairly common problem, start searching for EVAP system problems and read up on what others have found.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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