Actually, I've realized that it isn't so much that it is rough, but it will all of a sudden cut out. I'm beginning to think that it is air bubbles in the line. It is certainly not a dead miss like low compression or a leaky injector. It will idle then jerk like a shut down then continue. It will do this several times until I rev the engine or just let it clear out. The, use to be, clear fuel lines are brown an very hard. I cannot see through them to tell if there are bubbles or not. Has anyone replaced these lines, and how much?

Thanks,