I doubt it is spark because you are lean, not rich

It is either too much air (vacuum leak) or too little fuel (dirty line/clogged filter, failing pump, dirty injectors).

Dealer tells me this is normal

Rotating the cop will allow you to test and find the bad one through trial and error (assuming you actually have one bad cop)

A bad coil, regardless of arrangement doesn't necessarily.

Learn the causes, symptoms, engine damage risks and proven repair methods for a spark plug blow out

Discover how to fix and prevent this engine problem.

When you’re driving down the road, the last thing you expect to happen is for the spark plug to shoot out of your engine

But what the heck does it mean when the unexpected happens and.

To fix a spark plug blowout, you can replace the damaged spark plug wire or boot, tighten any loose connections, and inspect the spark plug threads for wear.

Learn about engine spark knock and how it can lead to serious engine damage

Discover the common causes and symptoms of spark knock.

Fixing spark plug blowout involves replacing the spark plug or repairing damaged spark plug threads

Start by replacing the spark plug with a new one that meets the manufacturer’s specifications.

A spark plug blow out happens when a spark plug becomes completely dislodged from its threaded seat in the cylinder head