my car occasionally pulls to left & sometimes to right really bad.

Hello, "pulling" left but also right - and it only happens now and then -- it's quite an odd situation. Is this when cruising, accelerating or braking? If you had a tire causing a pull or an alignment issue, it would not be intermittent in nature, it would be constant. A brake concern or suspension concern could cause a variable odd pull. Stick with a repair shop or dealership with you and continue to demonstrate the concern to get to resolve it. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops