Spotty WiFi after replacing Airport Card
So, I replaced the Airport card in my MacBook Pro. While it works, the WiFi is very spotty on this device and SLOW (5mbps). The Internet speeds for all my other devices using Wifi is strong: 47 mbps - smartphones, iPads, MacMini, MacBook 13" Unibody 2009. I know the 2009 is vintage but I can't throw it in the landfill,
So here is my question: What do I replace now? I am completely baffled. (PS- All cables were just fine, no cuts, etc.)
Any help you can offer would be greatly appreciated!!