been bearing with this problem for years already. ride is mazda 323 familia 1997. kapag may pasahero sa likod may tumutonog na parang latang walang laman (rear right area) but not all the times. minsan meron minsan wala naman. ilang mekaniko na tumingin pero di pa rin mahuli. na check ko na lahat sa likod tools, seats etc. napalitan ko na shocks sa likod (2x in 3 years) including mounting and yun coil springs. i've given up already until i discoverd this site.. hope someone can help