Another check is to stand in front of the engine bay while someone gives it gas. Watch to see if it leans in that same direction when engine revs. I had a broken motormount once and was driving along, pushed on accelerator pedal, mount broke, engine leaned to one side, pulled on accelerator cable, the Pontiac 350 was WOT and HP won over the brake pads as I T-Boned a hopeless car driving by. I was spinning rear wheels with engine screaming and smoking front rubber applying brakes. Sixteen years old, scared the sh*t out of me and the people I smashed into.