when I was driving on the highway in fifth gear cruising around 70mph and I accel. up to 75mph,(around 3000rpm), and the needle of my boost gauge starts to shake strongly and I can feel the engine not running smoothly. I have downpipe and midpipe only on my car. Is this boost creep? But even under WOT it hasn't boost pass 10psi. Could it be anything to do with the 3k hesitation? I am just guessing any possiblities here please help!!