It always happens when it rains.

Its actually an 87 GMC pickup. The plugs were original, I crawled under it and found out the I'm told old and my arms arn't long enough to reach the plugs. So i had to crawl into the engine bay and the number 3 spark plug broke off when I was taking it out. I bought it to make some money and it has but I've been driving it all winter since my car accident and the Duster is getting rebuilt.