I HAVE A 2000 CHEVY SILVERADO 1500 4.8L V8. LATELY WHEN I PUT THE KEY IN THE IGNITION, IT DOES NOT TURN; I HAVE TO EITHER WIGGLE IT A FEW TIMES AND AT THE SAME TIME TURN THE STEERING WHEEL SO THAT IT WILL UNLOCK. THIS IS HAPPENING MORE AND MORE FREQUENTLY. wHAT IS GOING BAD, THE IGNITION LOCK CYLINDER OR SOMETHING ELSE?