Voltage fluctuation looks normal, it will change with engine speed.
I would clean the MAF to start and check for connection on the intake. Is the sound generator properly mounted? Loose hose clamp? How does the air filter look? Is it seated properly in the air box?
How did you buy the car, was it private party? Did it sit for a long time on a lot?
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"Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.
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