Stop in for a cup of coffee

Made it back home after car shopping for my grand Daughter. The car we went to look at only had 19,000 miles on it and looked in decent shape. Salesman said it was a 3 cylinder Chevy. OK! took it for a test drive and was making a banging noise on the front floorboards that even my feet could feel. We stopped opened the hood
and the engine was rocking like an out of balanced 3-legged dog. NOPE, took it back and walked away.