Did you hit anything recently? Did the problem just come out of nowhere or has it been getting worse and worse? You're explanation is kinda hard to follow, especially with no punctuation.
Is it only at certain RPM's? or at certain speeds only?
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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