I was wondering if there's any tale-tale signs that a valve seat is about to drop? The reason I ask is because my 02 LX has started to idle really rough. It started out as a very mild hiccup in the idle but has increasingly got worse to the point that it idles extremely rough when at a stop light or in park to the point that it will usually die unless you keep one foot on the brake and give it a little bit of throttle with the other. I've noticed it idles fine upon start up when the engine is cold but once the engine reaches operating temp the rough idle kicks in. It still drives fine with no noticeable loss in power. Not sure what's going on with her?