I installed my Cobb rear motor mount and access port and the weekend after I noticed when I go wide open throttle until 5500rpm or more, then shift and go right back to wide open, my car studders, usually 3 quick “duhduhduh” then carries on normal, it’s most noticeable in 4th-6th gears when I shift at 5500+rpm, any ideas?? Car has 100k kms