I have diagnosed all mounting and they are perfect but I notice when i don't add Hi-Oct then there are too many jerks but with Hi-Oct or good fuel it jerks but a few times.Secondly, my vitz vibrates when i steer, pressing horn, opening/closing windows/mirrors.I don't know what's wrong with it. May be Battery issue? Electrifier weaken? Because, i have installed HIDs, Sound System with AGS 65 AMP wet battery around 6,7 months old.
Please let me know