The engine vibrates really had when idling, it did have a cracked motor mount so I replaced the one that was cracked, the rest were fine but that didn't change the engine vibrating at all. I scanned the codes with an OBD II reader, one of the codes was P0420, and I can't remember the other code but it was for fuel to lean/misfire and the guy who scanned the codes for me accidentally reset the codes so until check engine light comes back on I can't scan to see what that code was. There is a faint smell of gas inside the car sometimes. I got new spark plugs I am going to put on today, I know it could also be 02 sensor, injector, and a few other possible things. I was just wondering if anyone else has dealt with the same thing already and could possibly eliminate some of the problems before I drop alot of money trying to replace different parts. lol