I think Hordak's idle is ever so slightly lumpy every now and again.
To combat this, A tank full of optimax + redex is currently going through his fuel lines and I'm booking it into the dealers for it's 72,000 mile service (it's a little overdue @ 75,000).
I'd like to have a look at the plugs in the meantime as they can tell you a lot about the general state of the engine, but it looks like removing them will be a multiple swear word job.... :rolleyes5
Anyone attempted this?