Rubber-banding and lag can be caused by a plethora of reasons and it is important to identify the source properly.
What made you think it is your wireless adapter that is causing the issue?
Is the Intel® Dual Band Wireless-AC 7260 the original card that came installed by factory when you bought your computer, is it a laptop or a desktop? Please provide full information on it.
Your post suggests you have installed it later, could you confirm?
Have you check with your ISP for possible issues?
Is your modem/router running the latest firmware?
Do you notice any ping spike when it occurs?
Does the FPS drops?
Does this happen with all games you play or just some?
Have you tried to play connected via a Ethernet cable to see if the same thing happens?
*If your wireless card has been installed after you bought you computer, please know that Intel does not support integrations and if it is a laptop, your best option will be to contact the OEM (Original Equipment Manufacturer) and check if they have any updates that could improve your experience. Check this link for further information: Intel® Wi-Fi Products — Regulatory Information Regarding Hardware Installation or Upgrade
If you're using QoS on your network, boost those to highest priority and things like email client down to lowest priority.
Are you using 'Wireless Zero Configuration', consider disabling it if you don't need it, as Windows* will be checking your network every 30 seconds for Wi-Fi connections. This can cause rubber-banding in some cases.
1. Control Panel > Administrative Tools
2. Click Services and scroll down to WLAN AutoConfig
3. Click WLAN AutoConfig & select Manual in Startup Type
4. OK, exit and reboot.