I reacently purchased a pair of your 49128 air shocks for my 65 pontiac bonniville i have instaled them properly they seem verry bouncy ?? With 20 or 30 psi they bounce like crazy like there is no shock ? I have 100 psi in them it lifts care few inches maintains hight but rids evtremly hard and still bounces a fair bit when driving over a cpl small bumps when car is parked if u bonce it it bounces a cpl times ? Have i goten a faulty set ive used air shocks many times with good reasalts the rear coils are new and susp is proper the car did not bounce previouslywith a gas shock i just wanted a bit of hight in back there is nothing in trunk this is a classic car thanks any help be appriciated im in port perry ontario got shocks from bensen auto parts new in a sealed box