I put gas in my car and the next day it was running crazy

Hello, if you have a concern specifically when your foot is on the brake, it could be a vacuum related concern, as the brake booster uses engine vacuum, and engine vacuum when used can alter running conditions when there's a problem present. I'd suggest looking in that area first. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops