2007 gen 2 slight surging at hiway speeds hear through the exhaust

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Oldtimer

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I had a local mechanic install a new alternator that I provided the parts on. Asked him for estimate for labor. Long story short, he forgot I was providing the parts and bought an expensive alternator and Installed It. When I went to pick it up found out what he had done and he had to remove his part and install my part and lost money on job. He was considerably upset even though it was his fault. After picking up my Trac the next time I drove it at highway speed it had a surging in the engine that you couldn't feel or see on the tach, you could only hear it through the exhaust. I'm suspecting it's the MAF. What do you guys think?
 

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