Beat a dead horse?

[TexasExcursion]

It is the sound a truck makes when it starts up cold. It can go romp romp romp romp before it steadies the idle. Just about as fast as you can say romp four times. If you have to ask, you have never heard it.

Dave

I used to have them too on cold mornings. Best way to describe it? Well, ever been to a monster truck show and listened to their trucks at idle? Romp, romp, romp....