Im tuned for 23lbs and the car runs great and everything but te last couple times i drove and pulled the car knock sensor flashed, thought about it knowing i have a faulty boost gauge i thought i was overboosting, ok so i turn down the boost to about 20 now when it was reading 24 before, no more knock sensor, problem fixed...and also sometimes when im driving and put the car into nuetral it the rpms will drop to about 500 then recover. Car has 272 cams. Car was tuned before i bought it and had respectable power with great feedback from the members here, am i overworrying? This is my first turnocharged car btw