Hey, smripper, welcome to GMTC! I've never had that problem but if you're curious, you should post in the 'General Chevy Tech' sub-forum. You can access it through this link:
http://www.gmtruckclub.com/forum/forumdisplay.php?17741-General-Chevy-Tech-Q-amp-A
Best of luck to you!
http://www.gmtruckclub.com/forum/forumdisplay.php?17741-General-Chevy-Tech-Q-amp-A
Best of luck to you!