I never play over 5k because of this issue. Noticed it never went into vtec at all. Sounded like it in video but it never did. It gets worse in vtec, chuggy and poppy. tach spikes like crazy.
Still no CEL, oil level good.. not sure why no vtec
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1999 Honda Civic Si
1984 S10 355 small block drag truck
1971 Toyota Pickup Converted 4x4
TR em1 crew #43 