My spark plug will not catch in my truck it keeps on kicking it out on 2001 Ford Excursion

I can't get it to hold the spark plug in

Asked by for the 2001 Ford Excursion
very common on these motor the threads are stripped in head. these heads only have about 4 threads in cyl head. we install a new thread insert to correct issue.DO NOT TRY THIS YOURSELF. I f you mess up it could cost u up to 2000.00 for repair. seek prof diag and work
Thank you so much
1 more answer
agree with gregs auto. need to get it to a shop to be repaired. threads are stripped.