I bought 2 of the cheap keyless remotes for my 99 mustang. I programmed the first one, and it worked perfect first try. When I tried to program the second one, both stopped working completely. I have tried to program them multiple times. After you turn the ignition 8 times, when you press a button the locks do go up and down, but when you turn the ignition off the remotes completely stop working. I am very frustrated. Is there something I'm missing or some kind of trick?