I have a 2000 GMC Sierra that came with a factory key fob and I bought two new ones off of eBay that have the same numbers as the one I have already everything should be compatible but I cannot get my truck to go into programming mode. when I try to put the truck into programming mode by holding the unlock button and inserting the key in the ignition and turning it on off on off all it does when I release the unlock button is the locks try to unlock twice instead of cycling like they're supposed to. Anybody else had this issue any tips? I've been playing with it for weeks now and cannot figure it out and I've searched every form I could find I don't usually Post in sites like this but I'm stumped