Ive replaced everything suspension wise except for the swaybar bushings (which im about to when i change belts) i even had the both motor mounts replaced this week. The car is now 95percent better, but going over harder bumps there is still some Fluttering thud that seems like its far foreward and on both sides. i think that sound is the sway bar bushings....and also there is a slightly louder fluttering thunk comming from the drivers wheel area... im not familiar with how these airshocks function. Ive replaced the passenger front shock a year ago when it popped andnwent flat, and the driverside is original at 106k mi. Do these just Wear Out from use and get noisey like normal shocks? Or do they just go flat?