Does Nascar Have a Rulebook?

Another race with a controversial ending and I am beginning to get sick of NASCAR picking and choosing when to throw a caution. With just a few laps before the halfway point at Pocono Jimmie Johnson blew a tire and had to drive pretty much the whole track with sparks flying and other cars driving out wide to keep clear. NASCAR did not deem this to be enough of a reason for a yellow, even though they had called a caution instantly when Robby Gordon had a flat in a similar situation earlier. As a result of that caution not being called, enough green flag laps were run to ensure that the drivers would pass the halfway point in the race, and in turn would end once the rain began. And who was the leader in the end? Jeff Gordon.
Now I'm not going to lie, I think that it is a complete coincidence that Gordon was the leader in the end, I don't believe that Nascar has any favoritism towards him as opposed to Ryan Newman or any of the other drivers. The strategy of short pitting in this situation was nothing short of a genius move by Jeff Gordon's crew chief Steve Letarte (though I may have been calling him an idiot if it hadn't worked out). I think those conspiracy theories are all just excuses because people hate to admit that Gordon knows how to win a race better than any other driver in the modern era.
Having said that though, it has become very apparent to me that NASCAR does like to bend their own rules to fit the situation as far as providing the most entertainment. I will admit, not knowing when it was going to rain and who was going to be out front when it did was the most exciting part of the whole race, and a caution would probably have ruined that. I'm just not sure if that makes it right or not. If they want to throw cautions all the time for nothing, then throw cautions all the time for nothing. If they want to try to keep as many green flag laps as possible and not throw a lot of cautions then do that, but make up your damn mind NASCAR. As the sport is growing, and more and more people are becoming interested in it, I think that consistency will become more and more important in its legitimacy to share a Sunday with the NFL.