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Yes, a machanical will come a go with acceleration / deceleration, as a rod knock or fuel pump rod spring.
Did you pull the valve covers and check for lose rockers or oush rods?
Yup, actually the first thing I did. Last year the rocker assembly loosened up on the opposite side. I could literally turn the bolts by hand on the # 3 & 4 cylinders.
All the rods and rockers were pretty snug on the side in question now.