I have a '92 Legend, just bought it. A serious vibration started during the end of a 700 mile trip... upon acceleration, the front end vibrated seriously, enough to make me pull over. It started out with a smaller vibration, and as the trip continued, it got worse. If I was just maintaining speed, it was okay, but when I accelerated, it got much worse. <br><br>I took the car to an independent mechanic, who suspected perhaps one of the coil packs had gone bad, but since the vibration was gone the next morning when I took it in, he couldn't diagnose it. He replaced all 6 spark plugs, which needed replacing anyway. It was almost as if the engine was missing - either one cylinder or more than one, and caused it to vibrate. <br><br>Since then, I haven't experience the problem nearly as bad. However, it's still there, on a smaller scale. I don't want to spend a lot of money at the Acura dealer and have him tell me the problem is normal for this engine. I also hate to think it's a transmission problem. <br><br>Thanks for any insight you can add...