do you hear any pinging at all when it does it?
It sounds like a possible fuel delivery problem, either too much or not enough, hopefully it is too much, cause not enough (lean) is dangerous.
do you have a fuel pressure gage that you can read while driving?
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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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