A girl I work with drives a 93 Wrangler with the inline 6. She knows I work on my Cruiser and asked me to tell her what was wrong with hers. I've never heard anything like it (granted, I'm no freakin master mechanic by any stretch of the imagination). It sounds like the engine is rattling internally at startup and idle, but goes away when she gives it gas. It doesn't sound like a valve problem... I'm in a suit, and the engine was covered with crud so I didn't mess with it too much. I know I'm not giving you guys much to work with, and I apologize... I just wanted to see if anybody has had a similar problem so I could give her some guidance.