Today i decided to finally try and clean my TB. I have an 05 Envoy SLT. The bolts on the TB were extremely tight so while i was trying to take the first one off i put a little too much pressure on it and it cracked a little bit near the screw hole.I still wasnt able to take it off because i think i need some wd-40 i dont wanna break it anymore. any suggestions or comments with taking the bolts off and the cracked tb? thanks. one more thing... when the car is off what position should the TB be in. is it closed or a little bit open?