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If the gas cap is the problem, it'll throw EVAP('Evap'orative Emission Control System) codes..
But judging by symptoms, I'll bet on MAF or Camshaft Position Sensor..
I always say 'replace MAF and CPS' lol but they really cause few major problems.
Such as, engine stalls after rough start, CPS sensor(most likely intake side) causes it. MAF sensor could cause tranny malfunction, throttle trouble, etc...
But your ride is 06..It's too soon those sensors are causing problems. +1 for get codes, ask them to use OBD2 or Peake scanner if they have it.
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