try check if urs car is using iridium or platinium plugs now, if not using either. then ngk or denso iridium will do, kindly visit their website n looks for ur car model in order to get the correct heat range for your ride. if u r lazy/not sure how to check, remove ur current spark plug n check its heat range. then u get the same heat range or colder(if ur car mod oledi) to perform better.
for the gear, check the atf if in sufficient amount or sent it to workshop for inspection during ur service.
jerk from udercarriage? wat mean? i cant get u
