On Sunday the better half and I were on our way downtown and on the hwy we were doing a little over 60 and speeding up to merge over to the fast lane.. When we hit around 70 and running about 14-15 psi the car shook very hard almost like someone had hit us in the rear 2-3 times.. It also did it today while on my way to work with the cruise set to 69 slight incline on the hwy but the shaking wasn't as hard and only running 6-7 psi.. When the wife was in the car after it had happened she asked what in the world was that I replied with I have no clue?!? I'm tuned, k&n, dp, reso delete and plugs to .028.. Any advise, spark blowout maybe?? Thanks in advance!!
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