yeah, pretty much, if cleaning the plugs dont help, its one of the two.

if you get a used one, its nice if the cars wheels are dead straight, once you take it out it will be centered. if the wheels are turned you'll have to center it.

i wound it up all the way to one side, slow and careful. then when it hit the end, i counted the full turns to the other side, then turned it back 1/2 that number, then installed it.