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I'm not sure if those are even issues to take your car in for... idle fluctuates a little when you turn on the ac anyway, because its drawing power. Crickets.. well that's also not a problem, its just the sound of the injectors.
As far as the technicians are, I wouldn't take my car to the dealer if I can help it only because I'm sure I know more of the car than they do lol. But I'd say its okay to take your car out as long as its not to joy ride but to trying assess your problems.
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