Hello, I need some help. I've got an 83 fj60 with zero compression on number 3 and 4 cylinders. Any suggestions? The engine has 241k on it. Compression on 1 is 120, 2 is 95, 3 is 0, 4 is 0, five is 110 and 6 is 105. It's just running really weak, its hard to get to 55 to cruise down the highway. Any ideas or help would be greatly appreciated. Thanks