Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
$75 is the average cost of a tune-up.
You are unlikely to find anyone available in the OC area within the next 3-4 weeks due to the holidays.
If you need the tune-up urgently, I can advise on a premium tuner who may charge $200+ to visit you within a week.
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