alright this is what happened i just bought a 92 talon 5 speed, and replaced the head with a new cyclone head, well when i fired it up it seemed as the timing was off, so we set it right but now at normal idle something is vibrating, i htink i bent 2 exhaust valves or the bearings something happened but at normal idle it vibrates to where the timing belt looks like its about to bounce off, but at 2,5K rpm, it sounds smooth as can be it runs like a champ though just at low idle it vibrates and makes a vibrateing noise NOT A PINGING or KNOCKING just vibrating, does any one know what it could be and what i can do to check???