Ok, so I been having really rough idleing lately, I only have a hks axle back, I use to have a cold air intake, but took that off way before. I run synthetic oil, The car usually sits 600rpms and shakes really bad..I tried resetting the ecu and letting it idle for 20 min and same results..I have 88k miles any input??

 

mine tends to do the same thing but not all the time. I have Injen CAI and Injen axle back. I've used MAF cleaner and throttle body cleaner, the car does run smoother for a bit but not long at all. So no idea. From what I've seen on this forum most of our cars do that, its normal for it.

 

600 rpm's is normal for idle. If it is shaking really bad, I would look into motor mounts.