Having issues with my throttle position sensor

has anyone replaced a throttle position sensor on their mustang? I'm trying to replace mine and the screws turn REALLY hard. I was wondering if they used a type of lock tight at the factory when they put them in, or some kind of locking system. Also, there is a small label on the throttle body that claims your not supposed to clean the inside of it. seems kind of weird so i was wondering if anyone knows why that is? thanks!

Posted via Mobile Device

yep, that was my problem too. I dont know what they used, but holy cow it took some effort to break loose. I got it tho and the stang is running better than it ever has!