Everything you do will help. I suggest having your uncle adjust mixture so car runs right on road and forget about smog for the moment. Get a temp operating permit and drive it for awhile. Changing oil could help if you've got a crankcase full of fuel. Remember HC is unburned fuel which can come from unmetered fuel like a dripping injector or a lean misfire. Also that car requires premium which influences smog readings. Also pull the pass side floor mat, put the car in open loop by disconnecting the oxygen sensor, and read the sensor output. your mechanic should know how to read that.

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